. Diseases and pests of cultivated plants [microform]. Ennemis des cultures, Lutte contre les; Agricultural pests; Ennemis des cultures; Agricultural pests. Diseases and Pests or Plants. form of blisters, so prevalent in our pear-orchards. The blistering of the leaves Is more apparent on the upper surface of the leaves, which turn at first r«ddish and, later, brown. In severe infestations the rigour of the tree is greatly impaired. This year (1019) the mites were more in evidence than usual In the Valley and attacked the young fruit to a considerable extent. This mite attacks the npp
. Diseases and pests of cultivated plants [microform]. Ennemis des cultures, Lutte contre les; Agricultural pests; Ennemis des cultures; Agricultural pests. Diseases and Pests or Plants. form of blisters, so prevalent in our pear-orchards. The blistering of the leaves Is more apparent on the upper surface of the leaves, which turn at first r«ddish and, later, brown. In severe infestations the rigour of the tree is greatly impaired. This year (1019) the mites were more in evidence than usual In the Valley and attacked the young fruit to a considerable extent. This mite attacks the npple, quince, hawthorn, and other trees, but serious Injury has so far only been oljserved on the Fig. 23. Ppar-leaf blliter-mlte, bigbly nugnlflrd. (After Parmtt Control.—Lime-sulphur, 1 part to 1) parts of water, applied Just before the buds open, has genernlly j)roven satisfactory in the control of thlx jK-st. It nuist. however, be applied at the right time. If applleil after the mites have deiMwlliil their egifs under the epidermis of the leaves the spray cannot be efrectlve. F^xijerhnonts con- ductetl In the State of New York Indicate that a distillate or kerosene emulsion spray fives the best results. The Red Sfioeb (Tetranychus himacuMun). The red s|)!(lor Is present every year In large numbers and Is a source of worry to many growers. It Is a very Indiscriminate feeder, attacking a large variety of plants. The plants most suscci'tible to serious infestutlim are greenhouse plants, hops, bush-fruits, prunes, anil Jiims, The adults hibernate over winter in the ground. Early in the spring those that have survived the wlntT ascend the trees or plants In their immediate vicinity. They spin fin- silken wi on the undcr-slde of the leaves on which the feninles deiiosit their eggs, and feed on the uiidcr-side of the leaves under their webs. They multiply very rapidly, and In favourable seasons are responsible for a great deal of injury. The fruit on severely attacked tree
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1916
