Thrip Infestation on Sweet Peppers in Fujian and Pathogenicity of Lecanicillium lecanii against Dominant Species of Thrips
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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. -
Key words:
- Thrips /
- sweet pepper /
- host preference /
- dominant species /
- Lecanicillium lecanii /
- pathogenicity
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图 1 甜椒蓟马对3种甜椒的嗜好性
注:①A,甜椒蓟马为害状;B,蓟马在3种甜椒上的虫口总量。②不同小写字母表示处理间差异显著(P<0.05)。
Figure 1. Preference of thrips on 3 varieties of sweet peppers
Note: ①A: Symptom of thrip infestation on sweet peppers; B: Total population of thrips on 3 varieties of sweet peppers. ②Data with different lowercase letters indicate significant difference (P<0.05) between treatments.
表 1 3种甜椒上蓟马的种群数量和相对丰度
Table 1. Population and relative abundance of thrips on 3 varieties of sweet peppers
蓟马种类
Thrip species特雅斯 Teyasi 路帅 Lushuai 布兰妮 Bulanni 种群数量
Population number
(P)相对丰度
Relative abundance
(R)种群数量
Population number
(P)相对丰度
Relative abundance
(R)种群数量
Population number
(P)相对丰度
Relative abundance
(R)花蓟马
Frankliniella intonsa730.67±57.18 a 91.31±1.83 a 1725.00±354.04 a 94.60±0.84 a 1538.00±61.65 a 94.93±0.72 a 黄胸蓟马
Thrips hawaiiensis60.00±13.75 b 7.46±1.33 b 81.33±16.26 b 4.53±0.91 b 65.00±7.55 b 4.03±0.61 b 棕榈蓟马
Thrips palmi10.00±4.58 b 1.23±0.51 c 16.00±4.58 b 0.87±0.08 c 17.00±9.17 b 1.05±0.55 c 注:P 表示Population;R表示Relative abundance(%);同列数据后不同字母表示处理间差异显著。
Note: P means Population; R means Relative abundance (%); Different lowercase letters in the same column indicates significantly different.表 2 菌株LL-01对花蓟马的LC50
Table 2. LC50 of LL-01 on F. intonsa
时间
Time/d回归方程
Virulence regression
equation致死中浓度
LC50/
(conidia·mL−1)95%置信区间
95% Confidence interval/
(conidia·mL−1)4 y=1.1428+0.5562x 8.60×106 4.55×106~13.39×107 5 y=1.9996+0.5157x 6.58×105 3.55×105~1.18×106 6 y=2.2679+0.4931x 3.47×105 1.70×105~6.46×106 7 y=2.2679+0.4931x 3.47×105 1.70×105~6.46×106 表 3 菌株LL-01对花蓟马的LT50
Table 3. LT50 of LL-01 on F. intonsa
孢子含量
Spore content/
(conidia·mL-1)回归方程
Virulence regression
equation致死中时
LT50/
d95%置信区间
95% Confidence
interval/d1×106 y=0.7912+5.8882x 5.19 4.16~6.47 1×107 y=0.8772+6.5684x 4.24 3.50~5.14 1×108 y=0.9855+7.0199x 3.73 3.06~4.54 -
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