The effect of benomyl on some invertebrate inhabitants of a red raspberry, Rubus idaeus, plantation in relation to fruit yield

Abstract

SUMMARYThe growth and yield increases in red raspberry which followed the repeated application of benomyl were not due to the suppression of pests. Benomyl had little effect on numbers of aphids and nematodes which, anyway, were insufficiently abundant to cause damage. Benomyl did, however, decrease the earthworm population.In the following years, when benomyl was no longer applied, significantly more canes died from midge blight in the plots treated most frequently with benomyl than in the untreated. This was probably a consequence of increased infestation by larvae of the raspberry cane midge (Resseliella theobaldi) in the benomyl‐treated plots because benomyl increased the extent of cane splitting and hence the number of egg‐laying sites for cane midge.