. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. Fis. 5. Pupa Cases of Cherry and Pear Slug. When disturbed these cells are very easily broken apart, a fact which might indicate that fall plowing can be used as a method of destroying the pupae, accord- ing to Marlatt. "During the heated season of July and August the transformation from the lar- val to the adult insect is quite rapid, the p
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. Fis. 5. Pupa Cases of Cherry and Pear Slug. When disturbed these cells are very easily broken apart, a fact which might indicate that fall plowing can be used as a method of destroying the pupae, accord- ing to Marlatt. "During the heated season of July and August the transformation from the lar- val to the adult insect is quite rapid, the pupal stage being assumed in from six to eight days, and the adult flies transform- ing and digging out through the soil some 12 or 15 days after the larva entered ;* According to the studies of Peck and Marlatt some of the larvae of this spring brood remain over in the soil until the following spring. This seems to be a pro- vision of nature to carry the species over, should anything happen to exterminate the regular line of succession, such as. Fig. 6. Egg of Cherry and Pear Slug. —After Ewinq. * C. C. Marlatt, U. S. Department Agricul- ture, Bureau of Entomology Circular 26, Second Series 1897. lack of food, unfavorable climatic con- ditions, etc. Natural Enemies Although furnished with a sticky cov- ering which acts as a repellant against all enemies, the insect is not entirely free from insect enemies, and in Europe some half dozen insect parasites have been reared from it. In this country a minute fly is said to sting the egg through the upper leaf tissue. Remedies White hellebore, one pound to 50 gal- lons of water. No foliage is injured and the slugs are nearly all dead on the day following the application of spray. "Black leaf-40" gives practically the same results as white hellebore and does not injure the foliage. "Black leaf-40" is more expensive to use than the hellebore. Hellebore is the best remedy to use for cheapness, efficiency and
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