. Bulletin. Natural history; Natural history. 10 heavily infested orchards, however, one may find three or four mines to a leaf, and 25 per cent, to 30 per cent., or even more, of the leaf sur- face is destroyed. From both kinds of injury, in the course of two or three seasons the trees in heavily infested orchards become unthrifty. Fig. 7. Injury to apple foliage by the feeding of the adult beetles in midsummei-. The beetles may. when sutfl- ciently abundant, make li\ce-\vork of the foliage. and incapable of a vigorous growth or the production of fruit buds. If the attack continues the lower
. Bulletin. Natural history; Natural history. 10 heavily infested orchards, however, one may find three or four mines to a leaf, and 25 per cent, to 30 per cent., or even more, of the leaf sur- face is destroyed. From both kinds of injury, in the course of two or three seasons the trees in heavily infested orchards become unthrifty. Fig. 7. Injury to apple foliage by the feeding of the adult beetles in midsummei-. The beetles may. when sutfl- ciently abundant, make li\ce-\vork of the foliage. and incapable of a vigorous growth or the production of fruit buds. If the attack continues the lower limbs die, since these are always much more severely injured than the upper ones; the tree is more susceptible to the effects of late spring frosts or other adverse conditions; and the generally unprofitable. (See Figure 10.). 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
