. Entomology : with special reference to its biological and economic aspects. Holcaspis globulus. A, galls on oak,natural size; B, the gall-maker, twicenatural Galls of Holcaspis diiricoria, on oak. Natural size. among Tenthrediiiidae (Hymenoptera) and Trypetid?e (Dip-teral, and OHC-or two a4iif)ng Coleoptera and affect the oaks (Figs. 2477248) far more often INSECTS IN RELATION TO PLANTS ^35 Fig, than any other plants, though not a few species select the wildrose. Cecidomyiid galls occur on a great variety of plants, andthose of aphids on elm (Fig. 249). poplar,
. Entomology : with special reference to its biological and economic aspects. Holcaspis globulus. A, galls on oak,natural size; B, the gall-maker, twicenatural Galls of Holcaspis diiricoria, on oak. Natural size. among Tenthrediiiidae (Hymenoptera) and Trypetid?e (Dip-teral, and OHC-or two a4iif)ng Coleoptera and affect the oaks (Figs. 2477248) far more often INSECTS IN RELATION TO PLANTS ^35 Fig, than any other plants, though not a few species select the wildrose. Cecidomyiid galls occur on a great variety of plants, andthose of aphids on elm (Fig. 249). poplar, and many otherplants; while psyllid galls are most frequent on galls may occur anywhere on a plant, from the roots to theflo^y£rs orsee^sT^though each gall-maker always works on thesame partjxfit^lantj:—root, stem,bud, leaf, leaf-y_ein, flower., seed, etc. Galls^preseiitiniiumerable forms,but the form and situation of agall ai^e_aisua44y trharacteristic, sothat it .is^^fteiT- possible to classifygalls as,-species _e\en before thegall-maker is kiiowru Gall-Making.—The female cy-nipid punctures th^ jilant. ancLiay^san egg in the wound; the_^ggh
Size: 2217px × 1127px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
