Winter prevalence of obligate aphid pathogen Pandora neoaphidis mycosis in the host Myzus persicae populations in southern China: modeling description and biocontrol implication
AUTOR(ES)
Zhou, Xiang
FONTE
Brazilian Journal of Microbiology
DATA DE PUBLICAÇÃO
2012-03
RESUMO
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+(2.0H T H RH-20.2NI0)D)] (r²=0.897), where H T indicated daily hours of low temperature (<4°C), H RH daily hours of high air humidity (>90% RH) and I0 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.
Documentos Relacionados
- Method To Immobilize the Aphid-Pathogenic Fungus Erynia neoaphidis in an Alginate Matrix for Biocontrol
- Antibiosis and antixenosis of six commonly produced potato cultivars to the green peach aphid, Myzus persicae Sulzer (Hemiptera: Aphididae)
- Prevalence of genital human papillomavirus among rural and urban populations in southern Yunnan province, China
- Selection of reference genes for expression analysis in the entomophthoralean fungus Pandora neoaphidis
- Parasitism rate of Myzus persicae (Sulzer) by Diaeretiella rapae (McIntosh) in the presence of an alternative, resistant host