. Manual of fruit insects. tion chambers ex-cavated in the bark ofhealthy trees. The smallbrownish beetles (Fig. 244)emerge in early spring andat once begin to excavatetheir egg burrows under the Fig. 244. -The peach bark-beetle (x 22). ^ark of. Weakened Or dying trees. These burrows usuallyrun transversely around the branch and are distinguished fromthose of the preceding species by having a short side branch () which with the short tunnel running to the entrance hole inthe bark makes a Y-shaped end to the main egg burrow. The sidebranch enables the female to turn around in the burrow
. Manual of fruit insects. tion chambers ex-cavated in the bark ofhealthy trees. The smallbrownish beetles (Fig. 244)emerge in early spring andat once begin to excavatetheir egg burrows under the Fig. 244. -The peach bark-beetle (x 22). ^ark of. Weakened Or dying trees. These burrows usuallyrun transversely around the branch and are distinguished fromthose of the preceding species by having a short side branch () which with the short tunnel running to the entrance hole inthe bark makes a Y-shaped end to the main egg burrow. The sidebranch enables the female to turn around in the burrow and isalso occupied by the male at the time of mating. The minutewhite eggs are deposited in small niches in the walls of the mainburrov/ and are covered with sawdust. Each female may layfrom 80 to 160 eggs. Those of the first brood hatch in about20 days, while those of the summer generation require only abouthalf as long. The young grubs burrow away from the eggchamber at right angles and generally follow the grain of the. PEACH INSECTS 283 wood, but gradually diverge as they advance. In 25 or 30 daysthe full-grown grubs transform to pupse in the enlarged endsof the burrows near the outer surface of the bark. From 4 to6 days are spent in the pupal stage, but as a rule the beetles donot emerge until a week or two later. In northern Ohio thereare two generations a year, the beetles appearing in greatestnumbers in March and earl}^ April, in July and again in October,when they go into hibernation. The broods overlap, so thatafter July all stages are present under the bark until cold weather.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
