Insects of Economic Importance;
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2Slingerland— Cornell Bull. 184.
Hammar— U. S. Bu. Ent. Bull. 89.
Hartzell — Geneva Bull. 331.
60 GRAPE INSECTS 6l like holes; about middle of July they begin to deposit eggs in masses under the loose bark on the canes and ti-unks ; the eggs hatch in about two weeks and the larvae drop to the ground where they make their way to the roots through cracks and crevices of the soil; they live upon the roots and become nearly and sometimes full- grown by fall ; in November the \arvse burrow to a dept...h of a foot, form cells in the soil and pass the winter; in early May they return to the roots, feed a short time and change to pupse along in the middle of June; the partly grown larvae may feed longer ; the pupal stage lasts about two weeks when the adults appear, thus completing the life history; one generation a year.
Control — Ciiltivation about the roots of the vines with a horse-hoe during the first two weeks of June is of benefit in destroying the pupae. If beetles are only moderately abundant, spray vines within one week after beetles first seen with 6 pounds of arsenate of lead in lOO gallons Bordeaux; if beetles abundant, use the sweetened mixture of six pounds arsenate of lead, lOO gallons water and 2 gallons molasses; rains will wash this mixture off and it must be repeated to be effective.
What to read after Insects of Economic Importance;?
You can find similar books in the "Read Also" column, or choose other free books by Glenn W Glenn Washington Herrick to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
2Slingerland— Cornell Bull. 184.
Hammar— U. S. Bu. Ent. Bull. 89.
Hartzell — Geneva Bull. 331.
60 GRAPE INSECTS 6l like holes; about middle of July they begin to deposit eggs in masses under the loose bark on the canes and ti-unks ; the eggs hatch in about two weeks and the larvae drop to the ground where they make their way to the roots through cracks and crevices of the soil; they live upon the roots and become nearly and sometimes full- grown by fall ; in November the \arvse burrow to a dept...h of a foot, form cells in the soil and pass the winter; in early May they return to the roots, feed a short time and change to pupse along in the middle of June; the partly grown larvae may feed longer ; the pupal stage lasts about two weeks when the adults appear, thus completing the life history; one generation a year.
Control — Ciiltivation about the roots of the vines with a horse-hoe during the first two weeks of June is of benefit in destroying the pupae. If beetles are only moderately abundant, spray vines within one week after beetles first seen with 6 pounds of arsenate of lead in lOO gallons Bordeaux; if beetles abundant, use the sweetened mixture of six pounds arsenate of lead, lOO gallons water and 2 gallons molasses; rains will wash this mixture off and it must be repeated to be effective.
What to read after Insects of Economic Importance;?
You can find similar books in the "Read Also" column, or choose other free books by Glenn W Glenn Washington Herrick to read onlineMoreLess
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