Studies on Entomophthora culicis(Zygomycetes:Entomophthorales) infecting Chironomus sp.(Diptera:Chironomidae) in Guangdong Province
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Key Words： Entomophthora culicis, Chironomus sp., infection rate, Guangdong Province, Entomophthorales
Abstract： This paper presents the first description of aspects of Entomophthora culicis infecting Chironomus sp. in China, including disease symptoms and occurrence dynamics. The primary conidia of E. culicis are campanulate, measure （14.6±1.5）μm×（10.8±1.2）μm and have a distinct apical point Secondary conidia are similar to primary ones but are smaller, measuring （11.0±1.1）μm×（8.0±0.5）μm. Resting spores are （29.3±1.9） μm in size and spherical to subspherical in shape. Infected insects are fixed to the substrate by rhizoids. The sporulating mycelium is greenish and covers the host completely. The infection rate of E. culicis was obviously different in three trees. The infection rate varied between seasons, being lowest in summer (0) and highest in spring (90.2%). There was no significant change in infection rate (93.5%—95.7%) from 2006 to 2009.