Winter prevalence of obligate aphid pathogen Pandora neoaphidis mycosis in the host Myzus persicae populations in southern China: modeling description and biocontrol implication
Braz. j. microbiol
;
43(1): 325-331, Jan.-Mar. 2012. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-622820
ABSTRACT
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.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Afídeos
/
Verduras
/
Monitoramento Ambiental
/
Fatores Abióticos
/
Fungos
/
Hibernação
/
Modelos Anatômicos
/
Micoses
Tipo de estudo:
Estudo de prevalência
/
Estudo prognóstico
/
Fatores de risco
Idioma:
Inglês
Revista:
Braz. j. microbiol
Assunto da revista:
Microbiologia
Ano de publicação:
2012
Tipo de documento:
Artigo
País de afiliação:
China
Instituição/País de afiliação:
Zhejiang Agricultural and Forestry University/CN
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