Pesticides: More toxic than previously thought?

The only time I've had a significant problem with bug damage in my garden is when I lived near a cotton field.

http://www.eurekalert.org/pub_releases/2015-08/mu-pmt080615.php

Public Release: 6-Aug-2015
Pesticides: More toxic than previously thought?
Changes in personality of jumping spiders suggest effects of insecticide exposure may have been underestimated
McGill University

Insecticides that are sprayed in orchards and fields across North America may be more toxic to spiders than scientists previously believed. A McGill research team reached this conclusion after looking at changes in the behaviour of individual Bronze Jumping Spiders both before and after exposure to Phosmet, a widely used broad spectrum insecticide. It is a finding with far-reaching implications for agricultural production and ecosystem health.

"Bronze jumping spiders play an important role in orchards and fields, especially at the beginning of the agricultural season, by eating many of the pests like the oblique-banded leafroller, a moth that attacks young plants and fruit," says Raphaël Royauté, a former McGill PhD student whose study on the subject was published in Functional Ecology recently. "Farmers spray insecticides on the plants to get rid of these same pests, and it was thought that it had little significant effect on the spiders' behaviours. But we now know that this isn't the case."

The researchers discovered this fact by focusing on the way that exposure to insecticide affected the behaviour of individual spiders, including things like their ability to leap on prey and their interest in exploring new territory, both of which are crucial to their survival and to their role in keeping down pests.

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"By looking at the way that insecticides affect individual spider behaviours, rather than averaging out the effects on the spider population as a whole, as is traditionally done in scientific research, we are able to see some significant effects that we might have otherwise missed," says Chris Buddle, who co-authored the paper. "It means we can measure the effects of insecticides before any effects on the spider population as a whole are detected, and in this case, it's raising some red flags."

The researchers hope that this study will lead to the reevaluation of procedures used to estimate the toxicity of insecticidal compounds by encouraging other researchers to pay more attention to effects occurring at the individual level.