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| Effects of rose infected by powdery midew on feedingbehaviour of beet armyworm and its mechanism |
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| Abstract: |
| It is well-known that the interactions between phytopathogenic fungi and herbivory insects on their
shared host plants exist commonly. But the interaction was studied mainly under macro ecological methods in most of
researches. Thus， they remain unclear whether the spacial effect exists in the interaction between fungi and insects
and how to interact each other. In the present study， the inhibitory effects of rose infected by powdery mildew infection
on beet armyworm， the spacial effects， and the mechanisms of inhibition were studied. The results showed that the
infection of rose plants by rose powdery mildew caused the decrease of amounts of leaf area consumed by larvae of
beet armyworm（from 989.1 mm 2 to 198.5 mm 2 ） ， demonstrating a significant inhibitory effect on insects. The spacial
effects were found in the inhibition and the amounts of leaf area consumed gradually decreased with the increase of
infection level. The changing trends of inhibitions were the same as the trends of changes of water content in rose leaf
tissues caused by the infection（from 80.23% in healthy rose leaves to 60.59% in infected ones）. Therefore， the
results indicated that the decrease of water content in rose leaves caused by the infection was mainly responsible for
the inhibition of larvae. The results in the present study are very helpful to understand the interactions between fungi
and insects and its mechanisms. |
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