. Insect pests of farm, garden and orchard . Fig. 391.—Pear injured by theSan Jose scale showing thediscolored spots. SOME INSECTS INJURIOUS TO ORCHARD FRUITS 541 there are four or five generations a year, in the South there are])robal)ly niorc^ generations, while at th(> northern limit of thespecies there are two or possibh threc> generations, as breedingcontinues until after killing frosts. As with other small insects, it. -^v Fk;. 392.—Peach leaf bearing San Jose scales along veins. is the remarkable power of reproduction to which the destructive-ness of the pest is due. Thus it has b
. Insect pests of farm, garden and orchard . Fig. 391.—Pear injured by theSan Jose scale showing thediscolored spots. SOME INSECTS INJURIOUS TO ORCHARD FRUITS 541 there are four or five generations a year, in the South there are])robal)ly niorc^ generations, while at th(> northern limit of thespecies there are two or possibh threc> generations, as breedingcontinues until after killing frosts. As with other small insects, it. -^v Fk;. 392.—Peach leaf bearing San Jose scales along veins. is the remarkable power of reproduction to which the destructive-ness of the pest is due. Thus it has been estimated that at Wash-ington, D. C, the progeny of a single female would number3,210,080,400 by fall, if all were to survive. It is not surprising,
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
