Source: NCSU COOPERATIVE EXTENSION, 8/24/18


Another bollworm flight is on and, from the looks of it, there are many more moths in the system than the previous flight. This shouldn’t be surprising, since this insect undergoes multiple generations a year and can quickly build up numbers in each successive generation. Should cotton growers treat or not this late in the year?

The answer to that question is simple for some fields. There is solid research supporting the fact that just before fields reach cutout (at 5 nodes above white flower [4 NAW is cutuout]), cotton is safe from bollworms once an additional 350 DD60s are reached. Under average weather, this will occur at 2 1/2 weeks following cutout. So fields matching these conditions will not need sprayed.

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