The diamond–back moth infestation at Wellesbourne

One of the trials on cabbage at Wellesbourne (focused on aphids) was infested with diamond-back moth and we did a small pre-spray count (4 x 5 plants) before it was treated (with spinosad (Tracer) last Friday). There were an average of 8.7 caterpillars per plant on Friday before the spray was applied and 0.6 caterpillars per plant yesterday.

As the whole trial was treated there is no 'untreated control' so we cannot be certain that the numbers of caterpillars didn't decrease for another reason e.g. the weather - but the results do suggest that they succumbed due to the treatment.

Rosemary Collier : 28 Jun 2016 09:38 |  Comments (0) |  Report a problem