Control of Colorado Potato Beetle with Trigard, 1991

J. Sirota, E. Grafius, B. Ferrari, P. Kolarik, B. Scriber, S. Simstad, W. Boylan-Pett
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Abstract

Two fields in Bay Co., MI, were selected for trials using the insect growth regulator Trigard against CPB. ‘Onaway’ potatoes were planted on 17 Apr 1991, and 3 May 1991, respectively, and were managed by growers Brian Hugo and Jim Kryszak. Plots measuring 14 rows wide by 60 feet long were established in each field on 7 Jun in a randomized complete block design with 4 replications. Treatments were: 0.125 lb (AI)/acre (low rate); 0.25 lb (AI)/acre (medium rate); and 0.375 lb (AI)/acre (high rate; and an untreated control. The fields were sprayed on 7 and 19 Jun using a tractor mounted boom sprayer at 25 gal/acre and 40 psi. A maintenance spray program using insecticides effective against adult beetles was started on all plots the second week of Jul, after the summer adults had emerged. A pre-spray count of CPB egg masses, adults, and small and large larvae from one or two plants per plot was taken on 7 Jun. High numbers of large larvae were already present in the Hugo field at this time. Four plants per plot were sampled on 13, 20, 27 Jun and 2 Jul. On 2 Jul a qualitative defoliation rating was given to each plot based on the percent of plants in each of five defoliation categories. Potatoes were harvested from two 10-ft sections of row per plot in 19 Aug, sized and weighed.
用Trigard控制马铃薯甲虫,1991
在密歇根州贝公司的两个地区,选择了使用昆虫生长调节剂Trigard对抗CPB的试验。“Onaway”马铃薯分别于1991年4月17日和1991年5月3日种植,由种植者Brian Hugo和Jim Kryszak管理。6月7日,采用4个重复的随机完全区组设计,在每个地块建立14行宽、60英尺长的地块。处理为:0.125磅(AI)/英亩(低剂量);0.25磅(AI)/英亩(中速);和0.375磅(AI)/英亩(高速率;和未经治疗的对照组。6月7日和19日,使用拖拉机悬挂式喷雾器,以25加仑/英亩和40 psi的压力对该油田进行了喷洒。在7月的第二周,夏季成虫出现后,在所有地块上开始使用对成虫有效的杀虫剂进行维持喷雾计划。6月7日对每块地一株或两株CPB卵团、成虫和大小幼虫进行喷雾前计数。此时Hugo田间已经出现大量大型幼虫。在6月13日、20日、27日和7月2日,每个样地取样4株。7月2日,根据5个落叶类别中每个类别的植物百分比对每个样地进行定性落叶评级。8月19日,每行10英尺的两段土豆被收获,大小和称重。
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