Pest Control

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Reproduction or printing of material from this web site is prohibited. This material is excerpted from the book Greenhouse Gardener’s Companion by Shane Smith. 

Scroll down to see what you’ll find in the book Greenhouse Gardener’s Companion on pest control

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Are you having trouble with diseases on your tomatoes? If so, check this great tomato problem solver site out:

Controlling APHIDS in the Greenhouse

Some of the following advice is excerpted from the book “Greenhouse Gardener’s Companion” revised edition Copyright 2000 2013- all rights reserved.

Help I’m having problems with aphids in my greenhouse. I released some green lacewings and they don’t seem to be working.

It is a good idea to get these guys under control. I have had great luck with biological control using small parasitic wasps which really go after the aphids (as discussed in the revised version of my book). Aphidius colemani and Aphidius ervi are both good at controlling these critters.

Also, I have excellent luck w/ Aphidoletes aphidimyza. This aphid predator is also known as “aphid midge” and works great as a general feeder of aphids. The adults feed on flower nectar and pollen. The adults usually lay eggs near aphid infestations, and larvae hatch out and feed on the aphid for 3 to 6 days before burrowing into the soil to pupate into an adult. It kills the aphid by injecting a paralyzing toxin into the aphid and then sucking out their body fluids. It works best in the warmer months when the days are longer.

As far as the green lacewings, I would suspect that you have a bad supplier who shipped you some dead lacewings! Get your money back! Sadly, this happens all the time! Be sure your bugs arrive alive! Don’t just set them out without seeing them hatch and move. If not complain!

Now some spray options: Sprays that are kind to beneficials insects include: Beauveria bassiana, a fungus-based spray works well on aphids and has a low toxicity rating. Neem oil is also easier on predators and parasites and can help reduce the numbers of aphids when you release some beneficials to help. Be sure to check the neem oil label to be certain that it is safe for use on the crops you’re growing.

Other sprays: Soap sprays and horticultural oils work well on aphids but must be used with care as they can also cause burning on sensitive plants. They will also kill any beneficial bugs you might have released if you get direct contact w/ the spray.

Pyrethrins are botanically based and kill both good and bad bugs alike.

Always when you spray follow the directions and spray the underside of the leaves where the critters hide and multiply!

Chapter 10: When Things Go Wrong – What you’ll find in the book Greenhouse Gardener’s Companion

  • Managing Pets and Diseases in the Greenhouse
  • Your Best Defense
  • Causes and Effects of Problems: Animal,
    Mineral, or YOU?
  • Pest-Control Strategies
  • Integrated Pest Management (IPM)
  • The Basics of a Successful IPM Program
  • Sprays with IPM
  • IPM and Patience
  • Beneficial Critters That Feed on Many Pests
  • Sprays as Pest Controls
  • Alternative Sprays and Concoctions for Pest
  • Other Naturally Based Pest Sprays
  • Spray Adjuvants and Additives
  • Other Nonspray Pest Controls
  • Know Your Pests
  • Identifying Pests in Your Greenhouse
  • Common Greenhouse Pests
  • Weeds
  • Diseases
  • Organism-Caused Diseases and Characteristics
  • Disease-Control Strategies
  • Common Greenhouse Plant Diseases
  • Environmentally Caused Diseases
  • Diseases: A Final Word