John E. Dunley, dunleyj@wsu.edu, Tara M. Madsen, taram@wsu.edu, and Bruce M. Greenfield, greenfield@tfrec.wsu.edu. Washington State University, Department of Entomology, Tree Fruit Research and Extension Center, 1100 N Western Ave, Wenatchee, WA
Two projects were initiated in 2002 to examine alternative IPM programs for pear without using organophosphate insecticides or broad-spectrum neurotoxins. In one study, insect control was limited to using insect growth regulators. Comparisons were made over three years between the all-IGR program and adjacent conventional programs. Insect control was equal between the programs for most pests, including codling moth and pear psylla, however there was greater damage from both pear rust mite and grape mealybug in the program limited to IGRs. Costs and overall insecticide inputs were variable between programs over the study period.
An areawide organic insect pest management project was also established on 310 ac of pear in a small river valley in Washington. Here, IPM programs were based on organic insect control tactics. However, for the approx. 160 ac of pear that was Certified Organic, some insect growth regulators and other insecticides were used as needed. Over a three year period, insect control was equal among organic (Certified), soft, and conventional comparisons. Insect control costs were also not significantly different among programs each year. Pear production was also not affected by the IPM program, as cullage, yield, and size were not different among programs. Overall, selective IGR-based and organic IPM programs are feasible on an areawide basis.
Species 1: Lepidoptera Tortricidae
Cydia pomonella (codling moth)
Species 2: Hemiptera Psyllidae
Cacopsylla pyricola (pear psylla)
Species 3: Acari Tetranychidae
Tetranychus urticae (twospotted spider mite)
Keywords: IPM, Pear