排序方式: 共有133条查询结果,搜索用时 31 毫秒
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为明确黄瓜多主棒孢(Corynespora cassiicola)对生产上常用防治药剂啶酰菌胺的敏感性水平,采用平板生长速率测定法,检测来自天津6个区县的102株黄瓜多主棒孢对烟酰胺类杀菌剂啶酰菌胺的敏感性。结果表明,天津地区黄瓜多主棒孢对啶酰菌胺的药剂敏感性存在较大差异,EC50最小值为0.29 μg/mL,最大值为773.33 μg/mL;对啶酰菌胺的抗性频率为78.43%,其中高抗频率为4.9%。天津地区黄瓜生产中啶酰菌胺使用频率较高,啶酰菌胺具有中度抗性风险,该药剂在天津地区不适宜用于黄瓜棒孢叶斑病防治。 相似文献
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为了明确肉桂双瓣卷蛾对樟树的危害情况并筛选出防治该虫的环境友好型杀虫剂,作者采用标准地调查以及室外药剂防治试验的方法,进行了肉桂双瓣卷蛾对樟树的危害情况调查及不同杀虫剂对该虫的药剂防治试验。危害情况调查结果表明,樟树株被害率平均为92.9%、嫩梢枯梢率平均达76.6%,危害非常严重。8种药剂防治肉桂双瓣卷蛾结果表明,5%氯虫苯甲酰胺悬浮剂、16%虫线清乳油、40%氯虫·噻虫嗪水分散剂和8 000U/mL苏云金杆菌悬浮剂的防治效果均能达到90%以上,22%噻虫·高氯氟微囊悬浮剂的防治效果接近90%,因此建议在生产上,轮换使用以上杀虫剂。 相似文献
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J. P. Edwards Molina P. A. Paul L. Amorim L. H. C. P. da Silva F. V. Siqueri E. P. Borges H. D. Campos W. S. Venancio M. C. Meyer M. C. Martins R. S. Balardin V. J. Carlin J. F. J. Grigolli L. M. de R. Belufi J. Nunes Junior C. V. Godoy 《Plant pathology》2019,68(1):107-115
The lack of robust estimates of soybean yield losses due to target spot led to this study. The objective was to determine whether soybean yield at stage R8 (W, expressed as kg ha−1) was related to target spot severity at soybean stage R5–R6 (S, expressed as %) and to identify variables that could affect this relationship. Plot-level estimates of mean disease severity and yield from 41 selected Uniform Fungicide Trials carried out in Brazil during 2012–2016 growing seasons were used to estimate linear regression coefficients for the relationship between yield and target spot severity through random-coefficient mixed effects model analysis. The overall estimated mean regression intercept and slope were = 3564 kg ha−1 (disease-free yield) and = −17.1 kg ha−1 %−1 (W decrease per percent increase in S), respectively. The model was then refitted with different covariates to determine their effects on model parameters. β0 was influenced by baseline yield (less than or greater than 3300 kg ha−1) and β1 was affected by yield response to fungicide treatments. Estimated yield loss at 50% target spot severity ranged from 8% to 42%. Cultivar also had a significant effect on the magnitude of yield reduction due to target spot, which ranged from 11% to 42%, depending on the cultivar. 相似文献
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采用盆栽试验研究壳寡糖对茄子棒孢叶斑病的防治效果和减药效果。结果表明,100μg·m L~(-1)壳寡糖喷雾诱导茄子幼苗3次,对茄子棒孢叶斑病具有良好的防治效果,防效达62.56%。防御酶超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性均显著提高。100μg·m L~(-1)壳寡糖诱导3次后喷施50μg·m L~(-1)啶酰菌胺与单独喷施100μg·m L~(-1)啶酰菌胺均能显著降低茄子棒孢叶斑病病情指数,且二者防效相当,表明壳寡糖具有明显的减药作用。 相似文献
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多主棒孢霉(Corynespora cassiicola)是世界范围内重要的植物病原真菌,其引起的草莓棒孢霉叶斑病对草莓产业的健康发展具有潜在威胁。小柱孢酮脱水酶(scytalone dehydratase,SCD)是真菌多聚二羟萘类(DHN)黑色素生物合成途径中的关键酶,在植物病原菌致病过程中发挥重要作用。本研究通过同源重组的方法获得了草莓多主棒孢霉小柱孢酮脱水酶基因(CcSCD1)的敲除突变体,并进行了回补和RT-PCR验证。与野生型相比,敲除突变体△CcSCD1-2表现为菌落无色素沉积、菌丝稀疏、产孢量显著下降、分生孢子无色较小以及致病力明显减弱。结果表明,CcSCD1参与调控多主棒孢霉的黑色素生物合成、营养生长、分生孢子产量及致病力。 相似文献
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