Insects injurious to fruits . said to seek out and devour large quantities of the eggs of thecurculio. Fia. 199. Two species of parasites are known to attack thelarva of this pest. One,known as the Sigalphiiscurcnlio parasite, SigalphusGureulionis Fitch, is a small^black, four-winged fly, rep-resented in Fig. 198, where a shows the male, and 6 thefemale. With her sharp ovipositor the female punctures the skin of the curculio larva, Fig. 200. j j -^ j and deposits an egg under-neath, which in due timeproduces a larva, as shownata. Fig. 199. When thecurculio larva is destroyedby the parasite, th
Insects injurious to fruits . said to seek out and devour large quantities of the eggs of thecurculio. Fia. 199. Two species of parasites are known to attack thelarva of this pest. One,known as the Sigalphiiscurcnlio parasite, SigalphusGureulionis Fitch, is a small^black, four-winged fly, rep-resented in Fig. 198, where a shows the male, and 6 thefemale. With her sharp ovipositor the female punctures the skin of the curculio larva, Fig. 200. j j -^ j and deposits an egg under-neath, which in due timeproduces a larva, as shownata. Fig. 199. When thecurculio larva is destroyedby the parasite, the 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. ATTACKING THE FRUIT. 1J^7 parasite, Porizon conotracheli Riley, is also an lehneuiuon fly,with similar habits and of about the same size as the speciesjust referred to. In Fig. 200, a represents the female, and6 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-g-ouger. Coccotorus scutellaris (Lee). While this insect has some points of resemblance to theplum 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- Fi«- ~ 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
Size: 1896px × 1317px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidin, booksubjectinsectpests
