Half hours with insects . ^ or oleander leaf, knows how muchtheir form varies with that of the surface to which they are 9 42 HALF HOUKS WITH INSECTS. [Packaud. fittachcd. In the Pine-leaf Scale insect (Fig. 32 ; a, the leaveswith the scales of natural size ; &, male scale ; c, female. , the male greatly enlarged, after Riley) the scale markedd is much wider than in the one marked c, which lives on anarrower needle of the pine. Indeed so great is the rangeof variation that when we regard the larva-like females, itbecomes difficult to draw the limits between the species. Nearly every tree
Half hours with insects . ^ or oleander leaf, knows how muchtheir form varies with that of the surface to which they are 9 42 HALF HOUKS WITH INSECTS. [Packaud. fittachcd. In the Pine-leaf Scale insect (Fig. 32 ; a, the leaveswith the scales of natural size ; &, male scale ; c, female. , the male greatly enlarged, after Riley) the scale markedd is much wider than in the one marked c, which lives on anarrower needle of the pine. Indeed so great is the rangeof variation that when we regard the larva-like females, itbecomes difficult to draw the limits between the species. Nearly every tree of the orchard and our hard Avood, de-ciduous trees harbor one or more kinds of scale insect. Theoyster shell scale insect of the apple tree is an unfailing at-tendant and to young trees is extremely pernicious. Theorange trees of Florida have been at times grievously afflictedby another species, while our ornamental shrubs and vines, Fig. Parasite of Scale Insect. and hot-house plants suffer greatly from their attacks. Theinjury they do is the result of their vast numbers, sincethey cluster on the leaves and stems of plants, puncturingthe skin or bark and sucking the sap flowing beneath. Happily they have their parasites, certain exceedinglysmall ichneumon flies, such as CoccopJiagus and Aplielinus(Fig. 33 ; &, antcnnre, c, larva, all greatly enlarged, afterLcBaron) which prey upon them. It is not rare to find ascale insect with a large round hole in the top of its bod}^,through which the ichneumon has escaped. Mites are alsoknown to prey upon their eggs. The Imported Currant Saio Fly. — This dreadful pest ofcurrant and gooseberry bushes affords an excellent exampleof the mode in which an imported animal flourishes far 10 Packakd] IXSECTS of THE GARDEIST. 43 beyond its natural limits when introduced into a new coun-tf}, where its native insect parasites and bird enemies (ifsuch there be) cannot reduce its numbers
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1881
