Insects injurious to fruits . said to seek out and devour large quantities of the eggs of thecurculio. Two species of parasitesare known to attack thelarva of this pest. One,known as the Sigalphnscurculio parasite, Sigalphiiscurculionis Fitch, is a small^black, four-winged fly, rep-resented in Fig. 198, where a shows the male, and b thefemale. With her sharp ovij)Ositor the female punctures the skin of the curculio larva,and deposits an egg under-neath, which in due timeproduces a larva, as shownat«. Fig. 199. When thecurculio larva is destroyedby the parasite, tlie latterencloses itself in a
Insects injurious to fruits . said to seek out and devour large quantities of the eggs of thecurculio. Two species of parasitesare known to attack thelarva of this pest. One,known as the Sigalphnscurculio parasite, Sigalphiiscurculionis Fitch, is a small^black, four-winged fly, rep-resented in Fig. 198, where a shows the male, and b thefemale. With her sharp ovij)Ositor the female punctures the skin of the curculio larva,and deposits an egg under-neath, which in due timeproduces a larva, as shownat«. Fig. 199. When thecurculio larva is destroyedby the parasite, tlie latterencloses itself in a small,tough cocoon of yellowishsilk, 6, and then graduallyassumes the pupa state, as shown at c ; all these figures aremagnified. The other species, known as thePorizon curculio Fig. ATTACKING THE FRUIT. 187 parasite, Porizon conotraclieli Riley, is also au Ichneumon fly,with similar habits and of about the same size as the speciesjust referred to. In Fig. 200, a represents the female, andb the male, both magnified. Neither of these parasites hasyet appeared in sufficient numbers to act as an efficient checkon the increase of the plum curculio. No. 95.—The Plum-gouger. Coccotorus scutellaris (Lee). While this insect has some points of resemblance to thepUim curculio, it is in other respects so different as to be easilydistinguished. The beetle, which is shown magnified in , is about five-sixteenths of an inch long, with the thoraxand legs of an ochre-yellow color, while thehead and wing-cases are brown, with a leaden- Iig- tint, the latter with whitish and blackspots scattered irregularly over their wing-cases are without humps; the snoutis somewhat longer than the thorax, andprojects forward or downward, but cannotbe folded under the
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Keywords: ., bookauthorsaunderswilliam183619, bookcentury1800, bookdecade1880
