福建甜椒蓟马发生情况及蜡蚧轮枝菌对蓟马优势种的致病力

黄鹏; 张杰; 陈汉鑫; 蓝炎阳; 姚锦爱; 余德亿

doi:10.19303/j.issn.1008-0384.2022.004.012

福建甜椒蓟马发生情况及蜡蚧轮枝菌对蓟马优势种的致病力

Thrip Infestation on Sweet Peppers in Fujian and Pathogenicity of Lecanicillium lecanii against Dominant Species of Thrips

摘要

摘要:
目的明确福建甜椒蓟马发生情况及蜡蚧轮枝菌对蓟马优势种的生防潜力。
方法以主产地漳州的甜椒种植基地为观测点，调查3种甜椒品种上蓟马的种类和数量，测定蜡蚧轮枝菌LL-01对甜椒蓟马优势种的致病力。
结果甜椒路帅品种和布兰妮品种上蓟马数量近似且均显著高于特雅斯品种；甜椒上有花蓟马、黄胸蓟马和棕榈蓟马3种蓟马，其中花蓟马的相对丰度高达91.31%～94.93%。菌株LL-01侵染花蓟马7 d后的LC₅₀达3.47×10⁵孢子·mL⁻¹，1×10⁷～1×10⁸孢子·mL⁻¹处理的累计致死率为78.16%～87.36%，LT₅₀为3.73～4.24 d。
结论蓟马对不同甜椒品种的嗜好性不同，花蓟马为优势种；蜡蚧轮枝菌LL-01对花蓟马的致病力强，可用于该虫的生物防治。

Abstract:
Objective Thrips infestation on sweet peppers in Fujian province was surveyed, and potential of using Lecanicillium lecanii as a means of biological control against the dominant species of thrips was explored.
Methods Species and numbers of thrips that infested varieties of sweet peppers at vegetable farms in Zhangzhou, Fujian were surveyed. Pathogenicity of L. lecanii LL-01 on the dominant species of thrips was determined in laboratory.
Results The total thrip populations on Lushuai and Bulanni sweet peppers were similar but significantly higher than that on Teyasi. The thrips found were largely Frankliniella intonsa, Thrips hawaiiensis, and T. palmi, and among them, F. intonsa being the most abundant, accounting for 91.31-94.93%. The LC₅₀ of L. lecanii LL-01 was 3.47×10⁵ conidia·mL⁻¹ on F. intonsa 7 d after an inoculated infection. The cumulative lethality was 78.16-87.36% under treatments of 1×10⁷ to 1×10⁸ conidia·mL⁻¹ to reach an LT₅₀ in 3.73-4.24 d.
Conclusion Thrips had varied preferred host plants.F. intonsa was the dominant species that infested the sweet pepper varieties in the province. Since L. lecanii LL-01 was found strongly pathogenic to F. intonsa, it could be applied as a biological agent to deter wide-spread infestation.

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