. San Jose scale [microform]. San José scale; Fruits; Insect pests; Insectes nuisibles, Lutte contre les; Pou de San José; Fruit. tanalM btfeit thaN an fnU die. Thii probaUy talm pkot aarly in July, Um â¢net data nnfortanately waa not detanmnad. In Angnat the **^th haa raadMd ite fnU daralopmant, and ita body ia ao diatendad with egga that it oeoapiaa tha vhola of the cayity beneath the coTering. It then begina to lay ita egga, and aa it dMa ao ita body gradually geta amaUer and amaller, untU by the time th^ are aD laid it ia ao amaU that it can only with diificulty be seen beneatlvthe aihal
. San Jose scale [microform]. San José scale; Fruits; Insect pests; Insectes nuisibles, Lutte contre les; Pou de San José; Fruit. tanalM btfeit thaN an fnU die. Thii probaUy talm pkot aarly in July, Um â¢net data nnfortanately waa not detanmnad. In Angnat the **^th haa raadMd ite fnU daralopmant, and ita body ia ao diatendad with egga that it oeoapiaa tha vhola of the cayity beneath the coTering. It then begina to lay ita egga, and aa it dMa ao ita body gradually geta amaUer and amaller, untU by the time th^ are aD laid it ia ao amaU that it can only with diificulty be seen beneatlvthe aihall end of the aeale doae to the egga. The female diea very aoon after laying all h«r agga. There la only one brood a year in Ontario, though in oountiaa farther aouth tSne are two â I â¢^ i^^ v^ .i^* pwaalte Uphelinui mytilM- »Mto) of Ojrater-shell Scale. 2. Larm of para- â Ite la scale with scale Insect on one side and egfs on the other. 8. Pupa of parasite. All mnch enlarged, (after Sherman and Metcalfe). Rate o» Akkuai, Incmube.âAb stated above, the average number of eg« per female is between 40 and 50. If, as in the case of the San JoaA Scale, weallow for a mortality of about 50 per cent.âwhich I think is not too high for the Oyster- shell Scale, though probably much too high for the San Jos*âthere wiU not be more than 86 offspring from a single female in a year. The rate of increase there- fore is amall. Comparing this increase of 25 from one with 1,000,000 from one on the part of the San Jos* Scale, we can easily see why the latter scale ia so much more destructive and to be feared. MSANB 07 DiBTBIBITTION. The chief means of distribution for the Oyster-shell Scale, just as for 1^ San Jos*, is the shipment of infested nursery stock. It is also spread by the little cream-colored larvae crawling on birds, insects of various kinds, or almost any kind of moving thing Jhat comes in contact with them, and being carried by these to other trees. As
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Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectpests, bookyear
