In the augmentation strategy for biological control, inundative releases of gree
ID: 288731 • Letter: I
Question
In the augmentation strategy for biological control, inundative releases of green lacewings and lady beetles may be insufficient to keep pest insects below the economic threshold for a particular crop. What is one reason innate to the biology of these predatory insects that might cause the technique to fail?
An insecticide was sprayed on an adjacent field and drifted into the release site
The population density of the pest insect was low and the predators dispersed from the field in search of adequate food resources
The release through a modified sprayer had insufficient coverage to effectively reduce the pest population
The predators were attracted to nearby traps baited with semiochemicals
A.An insecticide was sprayed on an adjacent field and drifted into the release site
B.The population density of the pest insect was low and the predators dispersed from the field in search of adequate food resources
C.The release through a modified sprayer had insufficient coverage to effectively reduce the pest population
D.The predators were attracted to nearby traps baited with semiochemicals
Explanation / Answer
The statement A can be the reason for the failure of the technique because insecticide residue on the crop or the site or the insecticide drifting from the adjacent area to the release site can remain toxic to the natural enemies. Residue should be mitigated prior to release.
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