Aerial spraying was not deemed necessary in Markham. Aerial sprays do not reduce spongy moth populations over the landscape in the long term, especially when their presence is widespread and infestation levels are at their peak. They are also non-selective and can impact non-target caterpillars, who are an important source of food for many birds, pollinators and other wildlife.

Since aerial sprays require two applications within a very narrow timeframe which need to occur right after the caterpillars emerge and requires specific weather conditions, they are logistically complex. Due to the negative public perception associated with aerial sprays of pesticides, some homeowners/landowners and environmental groups may oppose aerial spraying of Bt.K.


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