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首页> 外文学位 >Influence of pyrithiobac and insecticide combinations on cotton growth and early season pest control.
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Influence of pyrithiobac and insecticide combinations on cotton growth and early season pest control.

机译：硫杆菌和杀虫剂组合对棉花生长和早期害虫防治的影响。

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摘要

Field studies were conducted at two locations in Northeast Louisiana, to investigate interactions associated with the herbicide pyrithiobac and insecticide combinations in respect to weed control and insecticide efficacy and cotton response. In addition, controlled environment experiments were conducted to evaluate the effect of temperature regimes and simulated thrips damage on pyrithiobac plus insecticide phytotoxicity to cotton.;Pyrithiobac and insecticide combinations when compared with pyrithiobac alone did not reduce cotton leaf area, height, main stem node number, main stem nodes to first square, days to first square or flower, main stem nodes above white flower, or seedcotton yield. Acephate insecticide alone in one experiment and oxamyl insecticide in two experiments reduced thrips larvae more than when in combination with pyrithiobac. Weed control was equivalent when pyrithiobac was applied alone or in combination with the insecticides acephate, dicrotophos, fipronil, imidacloprid, lambda-cyhalothrin, oxamyl, carbofuran, or dimethoate.;Presence of thrips on cotton did not affect cotton tolerance to pyrithiobac. However, differential cotton response to rate of pyrithiobac was observed. Cotton growth not reduced by pyrithiobac applied at four times the labeled rate of 0.07 kg ai/ha compared with nontreated cotton. Leaf area reductions as high as 58% were observed with eight and sixteen times the labeled rate. Significant reductions in cotton height were observed, but varied among years and locations. At Winnsboro, LA, pyrithiobac at 1.22 kg/ha increased total main stem nodes at square initiation by 1.2 nodes. Although significant reductions were observed in leaf area, cotton yield was reduced only in 1998 by pyrithiobac at 1.22 kg/ha (19%). In an additional study, the presence of thrips or simulated thrips damage did not change cotton tolerance to pyrithiobac regardless of application timing.;In the controlled environment study, cotton response to pyrithiobac; was not effected when cotton was stressed under a cool temperature regime (22/10 C day/night for 48 hours prior to application) or terminal removal to simulate thrips damage. Some injury to cotton was observed 7 days after treatment when pyrithiobac was applied with the insecticide malathion or dimethoate but injury was transient and less than 5% 21 days later.
机译：在路易斯安那州东北部的两个地方进行了田野研究，以调查与除草剂除草剂和杀虫剂组合有关的杂草控制和杀虫剂功效以及棉花响应方面的相互作用。此外，还进行了控制环境实验，以评估温度制度和模拟蓟马危害对硫代硫杆菌和杀虫剂对棉花的植物毒性的影响;与单用硫代硫杆菌相比，硫代硫杆菌和杀虫剂的结合并没有减少棉花的叶面积，高度，主茎节数，主茎节至第一方，天至第一方或花，主茎节在白花以上，或籽棉产量。在一个实验中单独使用乙酸杀虫剂，在两个实验中单独使用乙酰胺杀虫剂，与硫代硫杆菌联合使用时，可减少蓟马幼虫。当单独或与杀虫剂乙酰甲胺磷，敌百虫，氟虫腈，吡虫啉，λ-氟氯氰菊酯，草酰，碳呋喃或乐果组合施用时，除虫硫菌的防治效果是相同的。棉花上蓟马的存在并不影响棉花对除虫菌的耐受性。但是，观察到棉花对硫代硫杆菌的反应不同。与未处理的棉花相比，硫代硫杆菌以标记的0.07 kg ai / ha的施用量的四倍施用的速度不会降低棉花的生长。观察到叶面积减少高达58％，是标记率的八到十六倍。观察到棉花高度显着降低，但随着年份和地点的不同而不同。在路易斯安那州的温斯伯勒，以1.22 kg / ha的硫代硫杆菌在方形启动时使总主茎节增加了1.2个节。尽管观察到叶面积明显减少，但仅1998年，硫代硫杆菌以1.22千克/公顷（19％）的速度降低了棉花产量。在另一项研究中，蓟马的存在或模拟蓟马的损害并没有改变棉花对硫代硫杆菌的耐受性，而与施用时间无关。在较冷的温度条件下（棉花施用前48小时，每天22/10 C，每天48小时）或终末移除以模拟蓟马损伤时，对棉花无害。处理后第7天，当将硫代硫杆菌与杀虫剂马拉硫磷或乐果一起施用时，对棉花造成了一些伤害，但这种伤害是短暂的，在21天后不到5％。

著录项

  • 作者

    Costello, Richard Whitman.;

  • 作者单位

    Louisiana State University and Agricultural & Mechanical College.;

  • 授予单位 Louisiana State University and Agricultural & Mechanical College.;
  • 学科 Biology Entomology.;Agriculture Plant Pathology.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 68 p.
  • 总页数 68
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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