Baird, Craig R.

Sandvol, Larry E.

Undetermined

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Section II 12Foliage - and Seed-Feeding and Mining Insectswere confined to terminals a linear relationship existed between insectdensity and the number of buds killed. One adult destroyed an average of1.8 buds/day. If this degree of damage occurred under normal field conditions,an average density of one bug per plant has the potential of reducingyields by one kg of seed/ha/day.CUTWORMS - CONCORD GRAPESLarry Wright and Wyatt ConeIAREC, WSU, Prosser WA 99350Barriers for Control of Cutworm Damage to Concord Grape Buds •Strips of Teflon fabric were placed around concord grape vine trunksin 1980 with an adjacent vine as a control. Vines with barriers averaged4.3 indured buds while controls had 8.0. In 1981 and 1982, barrierswere placed on vines only and on vines and trellis posts. Although budinjury in the barrier treatments was higher than the economic damage level,than the barrier treated vines. Yield was significantly higher than theeconomic damage level, control vines in both years had significantlymore bud damage than the barrier treated vines. Yield was significantlygreater in the barrier treated vines being up to two times greater pervine and up to 9026 more kg/ha. This represents an increase of up to$1,592 per ha over the controls. The addition of barriers to trellisposts had little or no advantage over barriers on vines only.COLORADO POTATO BEETLE CONTROL WITH FOLIAR INSECTICIDAL SPRAYSLarry Sandvol and Craig BairdAberdeen Research and Extension Center, U. of Idaho, Aberdeen ID 83210'Russet Burbank' potatoes were planted May 20, 1982 in Declo siltloam soil. The experiment consisted of 18 treatments with 4 replicationsarranged in a randomized complete block design. Individual plots were4 rows (12 ft) wide and 36 ft long. Treatments were applied July 20,using a CO2 pressurized Aztec sprayer at 40 PSI to apply 20 gal H?0/A.Beetles were allowed to invade and multiply naturally. Pre- andpost-treatment counts were taken by recording the total number of beetlesin 36 ft of row. All synthetic pyrethroid formulations were effectivein controlling Colorado potato beetles. Nor-am and Standack treatmentswere somewhat less effective.Section II 13Foliage - and Seed-Feeding and Mining InsectsColorado potato beetle/36 ft rowTreatment and lb ai/acre 7-20-82 7-21-82 7-28-82Nor-Am 72129 .025 29.5 a-'Nor-Am 72129 .5 .83.0 aNor-Am 72129 .1 42.5 aCheck 72.3 aCheck 30.3 aPayoff 2.5 .12% 60.5 aPayoff 2.5 .25 17.5 aMavrik 2E .025 23.3 aMavrik 2E .05 67.0 aMavrik 2E .10 54.5 aSan 410Sc 1 qt 57.3 aSan 410Sc 2 qt 72.0 aFCR 1272 2EC .125 .76.8 aFCR 1272 2EC .255 .51.0 aFCR 1272 2EC .500 55.0 aStandack 2.6F lib 68.5 aStandack 2.6F h lb 48.9 aCheck 17.3 a— Numbers followed by the same letter are not significantly different(P=0.05) by Duncan's Multiple Range test..0 a .3 a2.8 b 5.0 be.8 a 1.5 b10.8 c 60.0 d3.3 b 54.5 d.0 a .3 a.3 a .0 a.5 a .0 a.0 a .0 a.0 a .0 a37.0 c 46.8 d13.5 c 1.8 b.0 a .0 a.0 a .0 a.0 a .0 a.0 a .0 a10.0 c 7.0 c23.5 c 71.8 dLYGUS BUG INJURY IN LENTILSL. E. O'Keeffe and D. J. SchotzkoDepartment of Plant, Soil and Entomological SciencesUniversity of Idaho, Moscow ID 83843We monitored lygus bug and aphid populations in 11 northern Idahoand eastern Washington lentil fields by sweep netting. All fields weretreated with dimethoate (0.5 lbs ai/a) applied by air in 5. gal of water.Untreated areas of 3 to 5 acres were left in each field. Lygus populationsoccurred at low levels (10/25 sweep) during the season and nymphal numbersincreased just before harvest. We were unable to detect population differencesbetween treated and untreated areas of fields but differences in damageto lentil as chalky spot was apparent. Pea aphid populations reachedlevels in excess of 1,000/sweep in untreated fields portions where reducedyields and lentil size was observed.

Colorado Potato Beetle Control with Foliar Insecticidal Sprays

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Colorado Potato Beetle Control with Foliar Insecticidal Sprays

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