. Manual of fruit insects. als as theabundance of the insects require. Black Leaf 40 tobaccoextract should be diluted at the rate of 1 part in 1000 partsof water for this purpose. To make the Uquid spread and stickbetter, 2 pounds of soap should be added to each 50 gallons. References Fla. Agr. Exp. Sta. Bull. 42, pp. 552-564. Agr. Exp. Sta. Bull. 46, pp. 80-103. 1898. Ground-beetlesHarpalus caliginosus Fabric!us and H. pennsylvanicus Dejean These two common species of the famiUar black ground-beetles (Fig. 332) have been reported as injuring the fruit of STRAWBERBT INSECTS 381 the s
. Manual of fruit insects. als as theabundance of the insects require. Black Leaf 40 tobaccoextract should be diluted at the rate of 1 part in 1000 partsof water for this purpose. To make the Uquid spread and stickbetter, 2 pounds of soap should be added to each 50 gallons. References Fla. Agr. Exp. Sta. Bull. 42, pp. 552-564. Agr. Exp. Sta. Bull. 46, pp. 80-103. 1898. Ground-beetlesHarpalus caliginosus Fabric!us and H. pennsylvanicus Dejean These two common species of the famiUar black ground-beetles (Fig. 332) have been reported as injuring the fruit of STRAWBERBT INSECTS 381 the strawberry in Pennsylvania, Ohio and Iowa. The favoritehaunts of these beetles are under stones and rubbish on theground, hence the usual mulch on a strawberry bed forms anideal lurking place for them. The larvae are said to be preda-ceous, and the beetles themselves have been generally consideredas beneficial insects. While their favorite food consists of otherinsects, they are often seen in the fall on ragweed, feeding on. Fig. 332. — Male and female of a ground-beetle, Harpalus caliginosus (x 2). the seeds. Both species are attracted to electric lights, wherethey often occur in immense numbers. Very Uttle is knownin regard to the hfe history or habits of the early stages of thesebeetles, and no explanation has been offered to account fortheir sudden appearance in such numbers in strawberry As strawberry pests these beetles have been known to destroya crop almost completely in a day or two. They hide duringthe day by thousands beneath the straw mulch and emergeat dusk to feed on the seeds of the berries. At first only theseeds are eaten (Fig. 333), but later most of the pulp of the ripe 382 FRUIT INSECTS berries is devoured; even the green berries are only a small part of the pulp is eaten, the berry is ruined,for rot soon ensues. In one case the beetles destroyed j\ ofa crop in two days. Treatment. Until more is known in regard to the life history and h
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
