Coop, Len B.

Drapek, Ray

Fisher, Glenn C.

Undetermined

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Section IIFoliage & Seed-feeding & Mining InsectsCORN EARWORM CONTROL ON SWEET CORN IN WESTERN OREGON, 1987Glenn Fisher, Len Coop & Ray DrapekDepartment of EntomologyOregon State UniversityCorvallis OR 97331-2907Jubilee var. sweet corn was seeded in 2 row plots 25 ft long on 20 May. Rowspace was 3 ft; distance between plants was 8 in. A completely randomized designwith 3 replications was used. Two sprays were made using the equivalent of 158 GPAof water on 8 August at ca 90% silk and again 11 days later on 17 August. An R & Dbackpack sprayer using a vertically held 3 nozzle boom (12 in. spacing) (LF3 80°flat fan nozzles) directed insecticides to the ear zone at 40 PSI. Plots wereharvested 1 Sept. selecting 50 ears from the middle 20 ft of each plot. Total CEWdamaged ears are presented below. All treatments significantly reduced CEW damage.Ears/50 damagedTreatment lb (ai)/acre I II III T x±/ % DamagedAmbush 2E .15 4 7 4 15 5.0 b 10Cymbush 3E .06 5 6 3 14 4.6 b 9.2Baythroid 2 .04 2 6 1 9 3.0 ab 6Baythroid 2 .05 1 2 2 5 1.6 a 3.2Asana 1.9EC .04 2 0 3 5 1.6 a 3.2Untreated - 19 17 24 60 20.0 c 40-' No.'s followed by same letter in vertical column are not significantly different(P>0.05) DMRT.******Corn Earworm Damaged Ears: x Distance of Damage from Tip in Centimeters.x Length of Damage from Tip in CentimetersTreatment lb (ai)/acre I II III T X % DamagedAmbush 2E .15 4.5 3.6 5.25 13.35 4.45Cymbush 3E .06 3.7 3.3 5. 12.0 4.Baythroid 2 .04 3.25 4.2 2.0 9.45 3.15Baythroid 2 .05 5. 2.75 5. 12.75 4.25Asana 1.9EL .04 3.5 0 3.3 6.8 2.67Untreated - 4.8 2.7 3.4 10.9 3.618

Corn Earworm Control on Sweet Corn in Western Oregon, 1987

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Corn Earworm Control on Sweet Corn in Western Oregon, 1987

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