. 1st report of Dr. Fitch on the noxious, beneficial and other insects, detrimental to agriculture, made to the New York State Agricultural Society. Beneficial insects; Insect pests; Insects. PEACH. ROOT THE BORER. ITS HABITS. Ill the former. The insect, however, does not commence coming out in its winged form so early as would be expected fxom the large size and matured appearance of many of the worms in the winter season. The stumps of five of my dead trees were allowed to remain undisturbed. Around these thirteen chrysalids were found upon the tenth of July, none of them having hatched the
. 1st report of Dr. Fitch on the noxious, beneficial and other insects, detrimental to agriculture, made to the New York State Agricultural Society. Beneficial insects; Insect pests; Insects. PEACH. ROOT THE BORER. ITS HABITS. Ill the former. The insect, however, does not commence coming out in its winged form so early as would be expected fxom the large size and matured appearance of many of the worms in the winter season. The stumps of five of my dead trees were allowed to remain undisturbed. Around these thirteen chrysalids were found upon the tenth of July, none of them having hatched the perfect insects. They were removed to a pot of moist earth, and the first winged moth came out upon the fourteenth of that month. The first female appeared upon the twenty-fourth, six males having hatched upon the preceding days. Twelve more chrysa- lids were found at this date and were placed in the pot with the others. Males and females continued to come out in about equal numbers afterwards, the two last of this stock making their ap- pearance upon the fifteenth of August. The pupa state there- fore lasts at least three weeks in the warmest part of the summer, and it appears to be the latter part of July and in August that the females come abroad to deposit their eggs in this latitude. Far- ther south they doubtless begin to appear earlier in the season. The eggs are smooth, oval, slightly flattened, of a dull yellow color and 0 025 long. Some of the dark blue scales from the tip of the abdomen of the parent are often glued to them. They are deposited upon the bark at the surface of the ground, and the worms hatching from them work downwards, at first in the bark of the root, forming a slender fiexuous channel which becomes filled with gum. At th*e distance of an inch or two below the surface the whole of the bark of the root be- comes consumed in badly infested trees, and the soft sap-wood is also extensively gnawed and eroded, so that frequently the root is nearly severed,
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectb, booksubjectinsects
