Three products based on compounds of biological origin were tested for their ability tocontrol the raspberry midge blight in theSiberian region of Russia. Bacillusthuringiensis subsp. israelensis(BACTICIDE®) and Streptomycesavermitilis metabolites (PHYTOVERM®) were used against Thomasiniana theobaldi (ageneral member of the midge blight) andCHITINASE was used against fungi (mainly Didymella applanata) associated with T. theobaldi. The BACTICIDE®(0.2%) and PHYTOVERM® (0.2%) sprays caused a 2-fold decrease in midge blight severity and the sameeffect was obtained with chemical insecticides.The CHITINASE (1%) spray caused a 4-folddecrease in the severity of midge blight. Inaddition, CHITINASE and PHYTOVERM®caused a significant suppression of theindependent spur blight. These studies form thebasis for further evaluation of ecologicallysafe control of the raspberry midge blight.

Field testing of BACTICIDE®, PHYTOVERM® and CHITINASE for control of the raspberry midge blight in Siberia

The Raspberry Cane Midge is principally important as a precursor of the fungal disease “ Midge Blight This disease may kill a substantial proportion of the canes of varieties such as Newburgh and Mailing Enterprise before they can bear fruit in the following spring (Pitcher and Webb, 1952) ; in addition, the yield of many of the surviving canes is reduced. Fortunately the midge is not a universal pest of raspberries ; in Britain its range is restricted to the south and the Midlands and several varieties, such as Norfolk Giant and Mailing Landmark, are highly resistant.

Observations on the Raspberry Cane Midge (Thomasini An A TheobaldiBarnes): III. Control

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Observations on the Raspberry Cane Midge (Thomasini An A TheobaldiBarnes): III. Control