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The Best Whitefly Insecticides

Every gardener has been faced with the eternal struggle of defending their plants from insects. Outdoor pests can ruin flowerbeds, decimate vegetable patches, and make all your efforts to cultivate the perfect garden completely futile. Among the worst offenders are whiteflies, a tiny moth-like bug that feeds on plant sap. Their effects on plants are often devastating while their rapid reproduction makes them very difficult to control. You have to move fast before the infestation gets out of hand! Waging war on whiteflies can, therefore, feel like a never-ending battle. Fortunately, there are several highly effective insecticides on the market. These will help you tackle whitefly infestations year after year. Read on to discover the best whitefly pesticides on the market and learn how to use them to effectively defend yourself from these and other garden pests.

Every gardener has been faced with the eternal struggle of defending their plants from insects. Outdoor pests can ruin flowerbeds, decimate vegetable patches, and make all your efforts to cultivate the perfect garden completely futile. Among the worst offenders are whiteflies, a tiny moth-like bug that feeds on plant sap. Their effects on plants are often devastating while their rapid reproduction makes them very difficult to control. You have to move fast before the infestation gets out of hand! Waging war on whiteflies can, therefore, feel like a never-ending battle. Fortunately, there are several highly effective insecticides on the market. These will help you tackle whitefly infestations year after year. Read on to discover the best whitefly pesticides on the market and learn how to use them to effectively defend yourself from these and other garden pests.

A HIGHLY EFFECTIVE FORMULA

AzaMax Botanical Insecticide

The very powerful formula in this natural insecticide will get rid of whiteflies quickly.

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KILLS MANY DIFFERENT PESTS

Ortho Insect Killer

This Ortho concentrate kills not only whiteflies but over 100 other pests you might find in your garden.

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THE BEST SYSTEMIC INSECTICIDE

Adonis 2F Insect Concentrate

This powerful systemic insecticide provides long-term relief from whiteflies and other pests.

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1

AzaMax Botanical Insecticide

A HIGHLY EFFECTIVE FORMULA
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What we like:

What we don't like:

  • Could become expensive if you have a large garden
  • Has a chemical odor

Review

This AzaMax Botanical Insecticide from General Hydroponics is a natural product that can effectively control a wide range of garden pests. Not only does AzaMax repel whiteflies but it’s also effective against spider mites, gnats, aphids, nematodes, leaf miners, beetles, thrips, and mealybugs. The active ingredient in this spray is azadirachtin, which is an extract of the neem plant and a highly effective biopesticide. This natural insecticide has very low toxicity in humans, making it one of the safest products you can use on your plants. In fact, AzaMax claims that all its ingredients are food-grade. That makes this insecticide entirely safe for household use, even for homes with children or pets.

The Azamax Botanical Insecticide comes with easy-to-follow instructions. Simply dilute the product with water, put it in a spray bottle, and get to work! Use it as a foliar spray to tackle insects like whiteflies and aphids. When used as a soil drench, it will take down nematodes and other ground-dwelling bugs. This product should be used every few weeks to effectively kill successive generations of pests.

The AzaMax spray is effective, but it also comes with a price tag that may put some people off. If you have a larger garden, flowerbed, or vegetable patch to treat, the cost of using this insecticide could really start to add up. It can also be very time-consuming to have to spray every few weeks! Another issue with this product is its strong chemical smell, which may make you think that it’s not 100% natural.

2

Ortho Insect Killer

KILLS MANY DIFFERENT PESTS
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What we like:

What we don't like:

  • May harm bees
  • Harmful to humans if inhaled or absorbed through the skin

Review

Ortho Flower, Fruit and Vegetable Insect Killer is a highly effective method of garden pest control. This insecticidal spray eliminates over 100 species of bugs including whiteflies, caterpillars, beetles, thrips, scale, aphids, and more. It can be safely applied to blooms, fruit, shrubs, and vegetables. It doesn’t have any adverse effects on the plants, so it’s suitable for use everywhere and anywhere you may need it.

This ready-to-use product even comes with its own wand to make spraying more comfortable! Simply spritz any plants suffering from an insect infestation and wait for it to work. One big advantage of the Ortho Flower, Fruit and Vegetable Insect Killer is that it remains effective for up to 4 weeks. This means you won’t need constant re-treatment.

The Ortho Flower, Fruit and Vegetable Insect Killer contains acetamiprid as its active ingredient, which is a chemical insecticide that is highly effective against whiteflies. Despite its ability to control garden pests, it may not be the ideal choice for use in your garden due to its potentially toxic effects on bees. These important pollinators are a highly beneficial species to have in your garden. Acetamiprid has limited toxicity in humans, so it’s fairly safe for domestic use. Make sure to read the instructions and to keep all children and pets out of the treated area until it’s completely dry.

3

Adonis 2F Insect Concentrate

THE BEST SYSTEMIC INSECTICIDE
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What we like:

What we don't like:

  • Not for use on edible crops such as vegetables or fruit trees
  • Takes weeks or longer to work if applied as a soil drench
  • Can be toxic to humans and pets if inhaled

Review

This Adonis 2F Insect Concentrate is a highly convenient, super-effective method of whitefly control. The formula contains imidacloprid, which is a systemic insecticide. That means that this product only needs to be applied once for year-round protection against a wide range of garden pests. When used as a soil drench, it will be absorbed and distributed throughout the stems, shoots, and leaves of the plant within a matter of weeks. Once inside the plant, it will kill any pest that ingests it! The Adonis 2F Insect Concentrate also kills on contact, so it can be applied as a foliar spray. This is not recommended, though, as it may kill bees and other beneficial insects such as ladybugs. Even though the active ingredient in the Adonis 2F Insect Concentrate is highly toxic to whiteflies, it has low toxicity in mammals. This means it’s fairly safe for domestic use, though it should still be used with caution.

Aside from whiteflies, this insecticide can also protect your flowers, shrubs, and trees from a wide range of other common pests. It effectively kills mealybugs, scale, thrips, beetles, mole crickets, ants, termites, weevils, aphids, chinch bugs, white grubs, and much more! The easy-to-follow directions on the bottle label will tell you exactly what dilution ratio to use. Once you’ve mixed the product with water, you’ll find that a little goes a long way. That makes this a highly cost-effective way of protecting yourself from whiteflies, even if you have a large area to treat.

The best thing about the Adonis 2F Insect Concentrate is that it only needs to be applied once a year. But keep in mind that due to its mode of action, it will not work immediately. The plant must absorb it from the surrounding soil for it to work, which is a process that can take weeks or even a month. It’s also unsuitable for use on edible plants, so, if you want to treat fruit trees or veggies, you’ll need to look for a non-chemical alternative.

Other Products to Consider

Criterion 75 WSP Insecticide

Like the Adonis 2F Insect Concentrate, Criterion 75 WSP Insecticide contains imidacloprid. This systemic insecticide is a very effective whitefly killer that will provide lasting protection from pests. However, the Criterion product is sold as a powder concentrate rather than a liquid. This makes it trickier to mix and increases the risk of contact with eyes and skin as well as of inhalation, which can present serious health hazards.

Bonide Systemic Insect Control

The Bonide Systemic Insect Control contains acephate as its active ingredient. This is a general insecticide that works well to eliminate whiteflies and many other species of garden pests. However, this chemical has a very strong, sulfurous odor that many people find unbearable. It also may take a long time to dissipate.

Hi-Yield Bug Blaster Bifenthrin 2.4

The Hi-Yield Bug Blaster Bifenthrin 2.4 can be used to effectively exterminate whiteflies as well as a wide range of other pests. Unfortunately, bifenthrin, the active ingredient in this product, is also highly toxic to mammals, birds, aquatic species, and bees. That makes it unwise to use this in your garden, especially if you have pets. If you do use it, make sure the area is completely dry before you allow any pets back in the area.

Whitefly Insecticide Basics

What are whitefly insecticides?

Whitefly insecticides are products formulated to effectively kill whiteflies. They usually combat the whiteflies along with a wide range of other common garden pests. The active ingredient in a whitefly pesticide will vary from product to product and may be natural or chemical. Some are used as foliar sprays while others are used as soil drenches. The frequency of application and suitability of a whitefly insecticide will depend on its active ingredient and application method.

When should you buy a whitefly insecticide?

Whiteflies are a common garden pest. They are often found in greenhouses, flowerbeds, veggie patches, and fruit trees. Since their effects on plants are often devastating, how can you be sure it’s whiteflies and not some other garden pest? If you suspect whiteflies are the culprit, keep an eye out for the following:

  • Live flies
    Whiteflies are small, white, and moth-like in appearance. They are most easily spotted when they take flight since they do so in a cloud formation when an infested plant is disturbed.
  • A sticky, yellow residue
    This is also known as honeydew. It is a shiny, sticky deposit that whiteflies secrete in large quantities. When this gathers on the surrounding foliage, it causes a dark, sooty mold to develop.
  • Yellowing disfigured leaves
    Whiteflies damage leaves by feeding on plants. So, if your plants have yellowing or disfigured leaves, it could be a sign that whiteflies have been feasting there.

Once you’ve discovered whiteflies on your plants, you should act immediately! These insects reproduce rapidly and are notoriously tricky to get rid of. Start using a whitefly control insecticide right away to prevent a large infestation from taking hold.

Who should buy a whitefly insecticide?

Whiteflies are prolific pests. They are quite common invaders found in ornamental plants, greenhouses, fruit trees, vegetable patches, and flower beds. That makes them a problem that every type of gardener can face! The best whitefly pesticides are easy to mix and use at home. They also have low toxicity in humans and other non-target species.

For Vegetable Patches

If you need to treat your veggies, herbs, or fruit trees, it’s best to use a non-chemical whitefly insecticide. Formulations containing neem oil are highly effective when applied as a foliar spray. The bonus is that these won’t harm your plants’ edibility.

For Large Gardens

If you aren’t planning to eat what’s in your garden, you can declare full chemical warfare on your whiteflies. Formulations that contain a systemic insecticide, such as imidacloprid, only need to be applied once a year. These are a highly effective way of defending your plants from whiteflies. These are also a great option for people with large gardens. They will save you from needing to reapply a pesticide every few weeks to kill successive generations of whiteflies.

How do whitefly insecticides work?

Whitefly insecticides work by killing whiteflies, larvae, and eggs. They are applied as either a foliar spray or soil drench, depending on the active ingredient. A wide range of whitefly pesticides are available for domestic use, but which should you choose? Start by checking out the active ingredient. It should be clearly listed on the label and will help you decide which will be best for you.

Common Active Ingredients in Whitefly Pesticides

To make things clearer, here are all of the pesticides that are most commonly found in whitefly insecticides. With these products, you’ll be able to knock out your whitefly population before it’s too late.

Systemic Insecticides

A systemic insecticide is a chemical that is absorbed by a plant and distributed throughout the plant tissue. This means the plant will kill any insect that feeds on it. Unlike traditional pesticides, you can’t wash it off or remove it by peeling the fruits/vegetables that come from that plant. That makes these unsuitable for use on edible plants. They are best at treating ornamental flowers, shrubs, and trees.

Imidacloprid

Imidacloprid is one of the most effective systemic whitefly insecticides. When applied as a soil drench, it can drastically reduce the insect and larvae population within a matter of weeks. This chemical provides lasting protection and only needs one yearly application to keep these bugs at bay. It also has low levels of toxicity in mammalian species, making it relatively safe to use around your home.

This shouldn’t be used as a foliar spray, however. This insecticide can negatively impact honeybees and other natural whitefly predators such as ladybugs.

Avoid using it on flowering plants or plants that are close to flowering for the same reason.

Acephate

You can use acephate either as a systemic insecticide or as a foliar spray to effectively reduce the number of whiteflies in your garden. However, as with imidacloprid, it has negative effects on honeybees and other beneficial insect species when used as a spray. Unfortunately, this chemical also has a powerful odor and can give your garden the lingering smell of rotting eggs or cabbage. That’s why this chemical isn’t very popular for domestic use.

Diafenthiuron

Diafenthiuron is a relatively new insecticide. It’s highly effective for controlling whiteflies, though. As with most other types of systemic pesticides, diafenthiuron is highly toxic to bees and shouldn’t be used as a foliar spray. It’s also highly toxic to aquatic species. So don’t use it if there is any chance of it leaching into bodies of water on or near your property.

Natural Whitefly Control Products

If you need a whitefly insecticide but don’t want to use potentially harmful chemicals in your garden, products containing neem oil and other extracts could be the perfect solution. You can apply these as a foliar spray on any plant in your garden. Insects must eat these products for them to be effective. As such, they are completely non-toxic to bees and other beneficial predators (such as ladybugs and spiders). They are also completely safe to use on edible plants. That makes these products a great choice for protecting your fruits and veggies from whiteflies.

Neem products are a fantastic, eco-friendly alternative to chemical insecticides. They are slightly less effective, however, and may not completely eradicate a large whitefly infestation.

You must also reapply these products periodically, which can be time-consuming if you have a large garden.

Additional Whitefly Control Methods

Whitefly insecticides can be an effective alternative to any of the following methods.

  • Vacuuming
    One way to remove whiteflies from your plants is to use a small, hand-held vacuum cleaner. Simply suck the bugs straight off your plants to physically remove them! This method is completely natural and may be effective if you have a very small whitefly problem. It’s unlikely to work on a large infestation, though.
  • Natural Predators
    Another organic method of removing whiteflies from your plants is to unleash an army of natural predators. Ladybugs will attack and kill whiteflies, so introducing them to your garden can help to control the problem. Keep in mind that this is unlikely to completely eradicate the problem. You may also have trouble getting your hands on enough ladybugs – you’ll need a lot of them!
  • Sticky Pads
    Sticky yellow pads can trap and kill whiteflies. Placing these glue traps near infested plants can help to reduce whitefly numbers. If you have a large population, this is unlikely to completely eradicate them but it can be an effective monitoring method.
  • Reflective Mulch
    Reflective plastic mulches can help to reduce whitefly populations by making it harder for them to locate your plants. This can prevent them from laying eggs and stop infestations from taking hold. Unfortunately, if you already have whiteflies, it won’t do anything to kill off the existing population.

Monitor your whitefly population throughout treatment.

Carefully monitoring your whitefly population is the best way to determine if the treatment method is working. Placing yellow sticky pads near infested plants will trap and kill whiteflies living on them while giving you an idea of how many bugs are living nearby at the same time.

Whitefly Insecticide Buying Guide

When choosing a whitefly insecticide, there are several factors to consider.

Do you have a large garden?

If you have a lot of plants on your property, foliar sprays can a time-consuming way of treating whiteflies. Opt for a systemic insecticide instead, such as the Adonis 2F Insect Concentrate. You only have to apply this once for annual protection. That means it can be a big time-saver for those with large gardens.

Do you have a large whitefly infestation?

Imidacloprid is a highly effective whitefly killer. You can use it to take down large infestations. Find an insecticide with imidacloprid as the active ingredient if you want to annihilate your whiteflies as quickly as possible.

Do you want to avoid using chemicals? / Do you want to treat edible plants?

It’s normal to be concerned about the idea of introducing chemicals into your garden’s ecosystem. That’s why products with neem extracts are a great natural option. Pesticides such as the AzaMax Botanical Insecticide are an eco-friendly alternative to harsh chemicals. They are less likely to harm honeybees or other beneficial insects. Natural insecticides are also better for edible plants such as vegetables and fruit trees.

Top Tips for Expert Use

  • Spray frequently.
    If you are using a foliar spray to tackle whiteflies, make sure to use it regularly and diligently. Whiteflies reproduce very quickly. That’s why repeated applications are essential to wipe out successive generations of these insects.
  • Use preventative methods.
    Consider using a reflective, plastic mulch around the base of infested plants during treatment. This will help to prevent additional whiteflies from moving in. You will also be able to tackle any infestations more quickly.

Conclusion

Whiteflies are one of the most common garden pests and are notoriously tricky to get rid of. These tiny, moth-like insects can infiltrate greenhouses, flower beds, and trees, causing an enormous amount of damage. They nibble on leaves to feed on plant sap and spread honeydew. As if that weren’t bad enough, this sticky residue encourages the growth of mold. They can decimate a carefully cultivated garden in no time!

Getting rid of your whiteflies as soon as you spot them is essential. But, choosing the best whitefly killer for your needs will depend on a variety of different factors. Systemic chemical pesticides are a great, one-time treatment for effective, lasting protection. If you have edible plants, though, a non-chemical alternative containing neem extract is a much better solution.

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