Fumigation investigations in California . infested with purple scale (Lcpidosaphes beckii). (Original.) and the cottony cushion scale (Icerya purchasi Mask.). Mealy bugs(Pseudococcus spp.) are quite generally prevalent. The most important pests other than scale-insects are to be foundamong the mites, of which the rust mite of the orange or silver miteof the lemon (Phyllocoptes oleivorus Ashm.) and the citrus red spider{Tetranychus mytilaspidis Riley) an4 highly injurious. The orangeaphis (Aphis gossypii Glov.) becomes very numerous during someseasons but is soon attacked by its natural enemies
Fumigation investigations in California . infested with purple scale (Lcpidosaphes beckii). (Original.) and the cottony cushion scale (Icerya purchasi Mask.). Mealy bugs(Pseudococcus spp.) are quite generally prevalent. The most important pests other than scale-insects are to be foundamong the mites, of which the rust mite of the orange or silver miteof the lemon (Phyllocoptes oleivorus Ashm.) and the citrus red spider{Tetranychus mytilaspidis Riley) an4 highly injurious. The orangeaphis (Aphis gossypii Glov.) becomes very numerous during someseasons but is soon attacked by its natural enemies and held in con-trol. A species of thrips worked quite extensively in some localitieson ripe oranges during the first months of 1908, removing the coloringmatter from beneath the epidermis, thus giving to the fruit a spottedappearance which lowered its market grade. The purple scale (figs. 2 and 3) appears to prefer the more moisldons in the vicinitv of the ocean. It is found in Santa Barbara 12 FUMIGATION INVESTIGATIONS IN and Ventura counties; in Los Angeles County, inward from the coastas far as Hollywood and Whittier, and in the lower part of the San Gabriel Valley atCovin a and Duarte;throughout OrangeCounty; and in SanDiego County in theregion about SanDiego city. This insectconfines its attack tocitrus trees. The black scale () is also considered aspartial to the moremoist regions, and with-out doubt is able tomature more freely here Fig. 3.—Fruit of orange infested with purple scale. (Oridnal.) n ,-i r ,. • , than in the hot interiorcountry. It is distributed, however, throughout the citrus-growinglocalities with the exception of the Rialto-Highland-Redlands regionof San Bernardino County. At Redlands this scale is found on olivesand some ornamentalplants; yet, to the bestof the writers knowl-edge, it has not beenreported from citrusorchards. Even as farinland as Ontario andRiverside the blackscale is capable ofbreeding freely duringsome parts of
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfumigation, bookyear1
