[NatureNS] Butterfly numbers and question about budworm spraying

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Date: Sat, 27 Aug 2016 22:17:29 -0300
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&gt;&gt;&gt; Sadly this is a global phenomenon. We are now very sophisticated wit
Without wishing in any way to distract us from discussion of the 
consequences of spraying Btk, I wonder if there is more than one 
significant mechanism affecting butterfly numbers this summer.

It was a very dry summer in many parts of the province. Is there any 
connection between amount of rainfall and the success of larval and 
pupal life-stages? It does seem that after a decent rain we get a flush 
of Cabbage butterflies, almost as if they have been waiting as pupae for 
some moisture to help them complete their development and emerge as adults.

Does anyone have any knowledge about the effect on lep pupae of 
rainfall? Does it affect emergence rates somehow?

Peter Payzant



On 2016-08-27 9:53 PM, Bev Wigney wrote:
> Last night, I did find a couple of references to Bt killing of non-target insects, and Leps in particular.

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