Warm winter weather doesn't mean more insects this spring and summer

Missouri

Many area lawn and garden enthusiasts are hoping above average winter temperatures don't result in terrible outbreaks of plant eating insects in 2006.

One local horticulture specialist says "not so fast" on the speculation that warm winter weather equals more insects.

"Anything I say on this topic is mere speculation. There are so many variables that predicting insect populations for next summer is as difficult as predicting the weather for June 3, 2006," said Gaylord Moore, horticulture specialist, University of Missouri Extension.

The first thing to remember, according to Moore, is that winter is not over and odds are there will be some cold temperatures prior to spring.

"Weather fluctuations bother insects because adults may be lured out of their hibernation by the unusual warmth and then killed when it suddenly gets cold again," said Moore.

Insects that pass the winter in the adult stage are the most likely to be affected by the fluctuations of weather. Various natural events can also have significant effects on insect populations.

"Between now and the bug season, predators, parasites, and diseases can play a larger role than temperatures as they are more likely to attack insect eggs, larvae and pupae," said Moore.

Dr. Bruce Barrett, entomologist with the University of Missouri, agrees saying warmer temperature effects on insects will vary depending on the pests.

"However, warm winter temperatures may prompt earlier emergence of some insects and an additional generation may be possible due to the length of season. As a result, greater numbers could be present due to additional generation or hatch," said Dr. Barrett.

Overall, there may be an earlier bug season in 2006 but that doesn't mean insects will be worse.

"Who knows? We can only wait and see. Besides, it may be below zero next week. It is winter, you know," said Moore.

"Gardening in Southwest Missouri" is a regular news article, distributed through the Southwest Region News Service, that provides unbiased information relevant to lawn and garden issues.

For more information, or answers to your specific lawn and garden questions, contact Gaylord Moore, horticulture specialist, University of Missouri Extension or the Greene County Master Gardener Hotline at 417-862-9284.

Date: 2/20/06