Winter prevalence of obligate aphid pathogen Pandora neoaphidis mycosis in the host Myzus persicae populations in southern China: modeling description and biocontrol implication.
Winter prevalence of obligate aphid pathogen Pandora neoaphidis mycosis in the host Myzus persicae populations in southern China: modeling description and biocontrol implication.
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DOI：
10.1590/s1517-838220120001000038
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发表时间：
2012-01
期刊：
影响因子：
--
通讯作者：
Zhou X
中科院分区：
文献类型：
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作者：
Zhou X
通过田间桃蚜种群中新蚜茧蜂的流行情况调查，研究了新蚜茧蜂的越冬情况。在真菌病开始后，每周采集田间小区中的卷心菜植物，以计数和检查被新蚜虫单胞菌感染的活蚜虫和死蚜虫。田间试验结果表明，田间温度（T）、相对湿度（RH）和蚜虫数对棉蚜的侵染水平（I）有一定的影响（每株植物的活蚜虫数，N）随天数（D）的变化，很好地拟合修正的逻辑斯谛方程I =0.91/[1+exp（8.5+（2.0 H T H RH-20.2 NI 0）D）]（r2 =0.897），其中H T表示每日低温（<4 ℃）小时数，H RH表示每日高空气湿度（> 90%RH）小时数和I 0原发感染水平。该模型揭示了影响新蚜虫拟单胞菌病冬季发生的生物和非生物因素，并验证了该真菌通过感染可利用的寄主蚜虫而不经过休眠期越冬。最终，新蚜虫疫霉真菌病使蚜虫种群减少了81.4%，显示出巨大的生物防治潜力。
Pandora neoaphidis overwintering had been investigated by monitoring its prevalence in Myzus persicae populations in open fields. Cabbage plants in field plots were weekly taken after mycosis initiation, to count and examine the living and dead aphids infected by P. neoaphidis . Based on the field data, infection levels ( I) varied with field temperature (T), relative humidity (RH) and aphid count (numbers of living aphids per plant, N) over days ( D), fitting well to the modified logistic equation I =0.91/[1+exp(8.5+(2.0 H T H RH-20.2 NI 0) D)] ( r 2=0.897), where H T indicated daily hours of low temperature (<4°C), H RH daily hours of high air humidity (>90% RH) and I 0 primary infection level. The model demonstrated the abiotic and biotic factors influencing P. neoaphidis mycosis development in winter, and also verifies the fungal overwintering by infecting available host aphids without a resting stage. Ultimately, P. neoaphidis mycosis reduced 81.4% of aphid populations, presenting great potential for biocontrol.