. [Fruit culture]. legs of the insect are of a dark reddish-brown color andthe long feet are black. The antennse of the rose chaferdiffer very much from those of the grape-root worm and grapeflea beetle, bearing knoblike structures at the tips. The adultbeetles feed on the blossoms and are thus able to destroy anentire crop; they also do much damage to the foliage. In Fig. 49 is shown the work of the rose chafer in reducinga crop of grapes. Fig. 50 shows the nature of the injury doneto a leaf by rose chafers. The adults emerge from the ground about the time the grapesare beginning to bl
. [Fruit culture]. legs of the insect are of a dark reddish-brown color andthe long feet are black. The antennse of the rose chaferdiffer very much from those of the grape-root worm and grapeflea beetle, bearing knoblike structures at the tips. The adultbeetles feed on the blossoms and are thus able to destroy anentire crop; they also do much damage to the foliage. In Fig. 49 is shown the work of the rose chafer in reducinga crop of grapes. Fig. 50 shows the nature of the injury doneto a leaf by rose chafers. The adults emerge from the ground about the time the grapesare beginning to blossom. Mating takes place during much ofthe time the adults are feeding. The females burrow into the §13 GRAPE CULTURE 75 soil, usually sandy soil, and deposit their eggs, which hatchby the first week in August. The larvas feed on the roots ofgrass until November, when they burrow to a depth of abouta foot and form larval chambers, after which they resumefeeding. During the latter part of May the larvas form cells. Fig. 50 in which they change to pupae. The pupal stage lasts from3 to 4 weeks. Control Measures.—Experiments have been made with vari-ous insecticides to kill the rose chafer. A mixture consistingof 10 pounds of arsenate of lead, 25 pounds of glucose, and100 gallons of water has been found to be the most effectivefor kilHng the insects. The spray should be applied as soon as 70 GRAPE CULTURE § 13 the insects appear. Experiments show, too, that the numbersof the rose chafer can be materially reduced by cultivatingthe soil when the insects are in the pupal stage. MISCELLANEOUS TROUBLES 85. Winter Killing.—Profitable culture of grapes ispossible in regions where, under natural conditions, the vinesare more or less injured by low temperatures. Indeed, some ofthe most profitable vineyards in the Northern States are inregions where the extra care to prevent winter killing is morethan paid for by the high price received for the fruit. Where winter injury is imminent,
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Keywords: ., bookcentury1900, bookdecad, booksubjectfruitculture, bookyear1912
