Written by cpm
It’s been a torrid season for oilseed rape with many growers questioning its place in their rotation. But should it be discarded on the back of an exceptional season or can the crop be managed better? CPM finds out. More than one pyrethroid application is just selecting for resistance. By Lucy de la Pasture A series of unusual weather events created a perfect storm for cabbage stem flea beetle (CSFB), says Dr Sacha White, senior research entomologist at ADAS Boxworth in Cambs. A very dry summer which extended well into the autumn meant many oilseed rape crops had a difficult time establishing due to lack of moisture and adult flea beetle damage. “Another warm winter meant that adults were able to continue egg laying for longer than usual, which resulted in record numbers of larvae and additional crop losses this spring,” he says. Results show the impact of volunteer OSR on numbers of adult CSFB.Source: ADAS, 2019 CSFB has become OSR’s number one enemy since the loss of neonicotinoid seed treatments, with 5% of the national crop lost in 2014/15 and 9% in 2016/17. This year AICC estimate that 11% will be lost on the basis of a…
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