. Insect pests of farm, garden and orchard . -^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,. Fig. .393.—Adult female San Jose scale, with scale removed to expose theinsect. (After Alwood.) therefore, that a tree wuth but a few scales on it in spring will becovered by them and the fruit unfit for market in the fall, and thatwith
. Insect pests of farm, garden and orchard . -^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,. Fig. .393.—Adult female San Jose scale, with scale removed to expose theinsect. (After Alwood.) therefore, that a tree wuth but a few scales on it in spring will becovered by them and the fruit unfit for market in the fall, and thatwith these millions of little Ijeaks pumping out the sap and poison-ing the tissues a tree soon succumbs. 542 INSECT PESTS OF FARM, GARDEN AND ORCHARD The pest has been spread mostly by being transported onnursery trees. Trees infested from the nursery will usually havemore scales on the lower trunk, from which they will spread tothe limbs, while those infested from neighboring trees will havemore scales on the young wood. Where the pest is abundantthe young insects are undoubtedly blown from tree to tree by the
Size: 1504px × 1661px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
