. Apple-aphides [microform]. Ennemis des cultures; Aphids; Apple; Pomme; Aphididés; Agricultural pests. migrates to it« summer host-plants, and by the en i July it has completely left the apple. In the autumn winged fall migrants return to the apple and deposit eggs. The green apple-aphis begins to hatch a few days later than the European grain-aphis. It docs not appear to develop as rapidl/, only reaching its highest point of infestation the summer months. In contrast to the two preceding species this aphis remains on the apple during its entire life-cycle, the migrants in summer and
. Apple-aphides [microform]. Ennemis des cultures; Aphids; Apple; Pomme; Aphididés; Agricultural pests. migrates to it« summer host-plants, and by the en i July it has completely left the apple. In the autumn winged fall migrants return to the apple and deposit eggs. The green apple-aphis begins to hatch a few days later than the European grain-aphis. It docs not appear to develop as rapidl/, only reaching its highest point of infestation the summer months. In contrast to the two preceding species this aphis remains on the apple during its entire life-cycle, the migrants in summer and autumn going from apple to apple. This aphis also aflfects the hawthorn, (juincc, and, to some extent, the .cf^rS'^' 4Sirthe*°«5.« „«^'a're KV(. ?U? minated from'the "apple-treea to aoine other food-plant S f ^It of an early spring attack. ' •'— "'-»'»'"'' uiu« iu<;»"- The Injury, aa aeen, (After Treherne, Ent Hoc.) Control Measures. The injury caused by aphides in favourable seasons is very severe. The curling of the leaves and the subsequent withering of the parts affected prevent the proper conversion of the plant-food into available lorm. In severe cases this greatly retards development and acts as a serious detriment to the vitality of the tree. Control is not difficult, rovided that sprays are thoroughly applied at the right times. In ..;.pie-orchards the first application should be made when the buds have Icveloped as shown in the accompanying illustration. The second uplication should be made just before the blossoms open, or shortly alcr that stage in the development of the apple commonly referred 3. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ruhman, M. H; British Columbia. Horticultural Branch. Victoria, B. C. : W. H. Cul
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1918
