Evaluation of Some Promising Soybean Genotypes to Infestation with Cotton Leafworm (Spodoptera littoralis) under Field Conditions

A two-year study was carried out in Giza Agricultural Experiments and Research Station, Agricultural Research Center (ARC), Giza, Egypt in the 2020 and 2021 summer seasons to evaluate the relative tolerance of ten soybean genotypes for cotton leafworm infestation under field conditions. Soybean genotypes H11L145, H155, H113, H4L4, H15L17, H129, H30, H19L96, Giza 111, and Crawford were distributed in randomized complete blocks design with three replications. Soybean genotypes differed significantly for cotton leafworm at the 6th, 7th, and 8th week from sowing. Low values of cotton leafworm assemblages were recorded for H113, H4L4, H15L17, Giza 111, and H129. Low percentages of the larval survival number and weight, as well as the number of the survival of pupa were recorded by feeding on leaves of genotypes H4F4, H15L17, and Giza 111 under laboratory conditions. There were significant differences among the studied genotypes in most yield attributes in both seasons. Soybean genotypes H15L17, Giza 111, H113, H129, H19L96, and H4L4 gave higher seed yield per ha, meanwhile soybean genotypes H155, H19L96, H30, Giza 111, and H15L17 had higher seed oil content than the other genotypes in both seasons. The number and weight of larvae surviving, as well as the number of pupa survival, were negatively correlated with leaf total phenols and seed oil content. It can be concluded that soybean genotypes H15L17, H4L4, and Giza 111 are promising genotypes with desirable seed oil content for tolerating cotton leafworm infestation in breeding programs.

Effect of Infestation of <i>Alabama argillacea</i>(Lepidoptera: Noctuidae) at Different Ages of Cotton Plants in Yield

The cotton leafworm is an important defoliating pest of cotton in Brazil, and occurs in all regions where the crop is cultivated. The purpose of this study was to evaluate the effect of larval densities of A. argillacea after different infestation periods on the yield components of four cotton cultivars. The experiment was carried out in Pindorama, SP, Brazil, in the 2008/2009 growing season. The cultivars IAC-25, DeltaOPAL, Fibermax 966 and Fibermax 993 were artificially infested with A. argillacea larvae at three times (30, 60 and 90 DAE) and four densities (0, 2, 4, and 6 larvae per plant). The average boll weight (g), fiber percentage (%), 100-seed weight (g) and yield (kg·ha-1) were evaluated. With increasing infestation density of A. argillacea, the cotton yield of the cultivars decreased. The presence of larvae significantly reduced the weight of 100 seeds of cultivar Fibermax 966. Initial infestations reduced the boll weight of IAC-25 and DeltaOPAL, while cultivars Fibermax 966 and Fibermax 993 were most affected by late infestations. Early infestation compromised fiber percentage of cultivar DeltaOPAL and late infestations were most harmful to cultivar Fibermax 966. Early A. argillacea infestation reduced the yield of DeltaOPAL, while infestations 60 DAE caused the most damage to IAC-25, and the other cultivars were not affected by the moment of infestation.

芋艿斜纹夜蛾发生规律及无公害防治技术初探

介绍了芋艿斜纹夜蛾的发生现状和发生规律,其成虫发生期主要集中在7-9月份,且有逐年延后发生趋势,在10、11月份发生趋重,提出了适宜无公害芋艿生产的农业防治、生物防治和物理防治等防治技术。

12种杀虫剂对斜纹夜蛾的防治效果

分别在室内和田间对 1 2种杀虫剂进行了防治斜纹夜蛾的药效试验。室内药效试验效果良好的药剂有 :4.5%高效氯氰菊酯乳油、1 0 %氯氰菊酯乳油、50 %辛硫磷乳油、2 0 %氰戊菊酯乳油和 1 .8%阿维菌素乳油等。田间试验效果良好的药剂有 2 0 %高氯·辛乳油、1 .8%阿维菌素乳油、4.5%高效氯氰菊酯乳油和 0 .2

高海拔山区斜纹夜蛾发生特点及防控措施

介绍高海拔山区斜纹夜蛾的发生特点及发生规律,并提出防控措施。

应用性信息素诱捕斜纹夜蛾效果研究

[目的]探究昆虫性信息素在防治斜纹夜蛾中的应用效果。[方法]研究了昆虫性信息素防治包菜、花菜、西兰花上斜纹夜蛾的效果。[结果]应用性信息素诱杀斜纹夜蛾成虫效果好,同时可降低田间虫口密度。[结论]为斜纹夜蛾的有效防治及蔬菜的安全生产提供了理论依据。

防治甘蓝菜田斜纹夜蛾和甜菜夜蛾药剂筛选试验

为指导蔬菜田斜纹夜蛾和甜菜夜蛾的科学防治,保障农产品质量安全,作者进行了10种药剂的田间药效筛选试验,结果表明:60g/L乙基多杀菌素悬浮剂40mL对斜纹夜蛾和甜菜夜蛾效果均表现优异,5%氯虫苯甲酰胺悬浮剂50mL/667m2、10%溴氰虫酰胺悬浮剂20mL/667m2、5. 7%甲氨基阿维菌素苯甲酸盐微乳剂10mL/667m2,及24%虫螨腈悬浮剂50mL/667m2,4个处理对斜纹夜蛾效果较好,见效快,药后3、7d防效均达90%以上,对甜菜夜蛾效果稍有下降。100亿孢子/m L短稳杆菌悬浮剂120mL/667m2对斜纹夜蛾药后3d效果不明显,但7d效果高达90%以上,药效发挥较慢。而斜纹夜蛾核型多角体病毒水分散粒剂6g处理药后3d的效果尚可,但药剂持效期不长。试验药剂对甘蓝生长安全。

甜椒斜纹夜蛾的发生与防治技术

介绍甜椒斜纹夜蛾的形态特征、为害特点、发生规律及生活习性,从农业防治、物理防治、药剂防治及利用天敌等方面总结其综合防治技术。

桂北柑橘产区斜纹夜蛾对毒死蜱的抗性检测

研究斜纹夜蛾对有机磷杀虫剂毒死蜱抗性大小结果表明,检测的桂北两地果园靶标昆虫对毒死蜱的抗性并没有有效的形成,与室内培育的敏感体系基本一致;在室内通过5代汰选之后抗性水平由1.2806上升到4.1063。