title: Winter prevalence of obligate aphid pathogen Pandora neoaphidis mycosis in the host Myzus persicae populations in southern China: modeling description and biocontrol implication.
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+(2.0 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.
authors.affiliation: Key Laboratory of Forest Protection, College of Forestry and Biotechnology, Zhejiang Agricultural and Forestry University , Lin'an 311300 , People's Republic of China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhou
keywords: Aphid; Entomopathogenic fungi; Entomophthorales; Epizootic modeling; Microbial control
references.citation: Insect Sci. 2013 Apr;20(2):254-60
references.pmid: 23955865
references.citation: Environ Microbiol. 2004 May;6(5):510-6
references.pmid: 15049924
references.citation: J Invertebr Pathol. 2008 Mar;97(3):282-90
references.pmid: 17964597
references.citation: J Invertebr Pathol. 2006 Jul;92(3):125-31
references.pmid: 16780867
references.citation: Environ Microbiol. 2007 Apr;9(4):859-68
references.pmid: 17359258