Outbreak of two gall midges, Harrisomyia n. gen. vitrina (Kieffer) and Drisina glutinosa Giard (Cecidomyiidae, Diptera) on maple, Acer pseudoplatanus L. in Czechoslovakia, with descriptions of the two genera and species
1986
Skuhrava, M. | Skuhravy, V.
The first outbreak of two gall midge species, Harrisomyia n. gen. vitrina (Kieffer, 1909) and Drisina glutinosa Girad, 1893, was observed in the western part of Czechoslovakia in the years 1980-1984. Larvae of both species develop on the leaves of Acer pseudoplatanus L. causing galls of two types: larvae of D. glutinosa produce small depressions of the lower surface, larvae of H. vitrina produce small pustule galls mainly on nerves of the leaves. There is only one generation a year. Adults of both species emerged on 20th to 23rd May, 1984, with peak daily activity in the morning. Larvae develop in galls on leaves for 2-5 weeks, then they drop to the soil where they hibernate until the spring of the following year. During the outbreak, 150 larvae, on average, were found on one leaf, with the highest average number of galls occurring on the leaves of the lowest branches of the maple tree. Both gall midge species are Central European species, belonging to colline elements, and occupy the whole distribution area of their host plant, Acer pseudoplatanus, with the exception of the southern part of Europe, viz. Spain, Italy and Greece. The abrupt increase of injurious occurrences of both species of gall midges at present may be connected with deterioration of the environment through pollution stress. In Czechoslovakia both species of gall midges, H. vitrina and D. glutinosa, are serious pests of maple, A. pseudoplatanus. Descriptions of the adults and developmental stages of the both species which hasn't been described, are given
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