. Insect pests of farm, garden and orchard . increase, the caterpillars be-come overabundant, they as-sume the army habit andmarch en masse, consumingall in their path. The next 3ear their naturalenemies will usually have themunder control again and therewill be but little damage, andthen they will not be observedas injurious for a series ofyears, though the moths arealways fairly common. Life Historij.—In the Norththe moths appear early in Juneand the females lay the small yellowish eggs in rows of fromten to fifty in the unfolded bases of the grass leaves, coveringthem with a thin layer of g
. Insect pests of farm, garden and orchard . increase, the caterpillars be-come overabundant, they as-sume the army habit andmarch en masse, consumingall in their path. The next 3ear their naturalenemies will usually have themunder control again and therewill be but little damage, andthen they will not be observedas injurious for a series ofyears, though the moths arealways fairly common. Life Historij.—In the Norththe moths appear early in Juneand the females lay the small yellowish eggs in rows of fromten to fifty in the unfolded bases of the grass leaves, coveringthem with a thin layer of glue. Over seven hundred may bedeposited by one female, so that when the young caterpillarshatch in about ten days, the progeny of a few moths mightform a quite destructive army. The worms usually feed entirelyat night, and thus whole fields will sometimes be ruined beforethey are discovered, though a few generally feed by day, asthey all do in cloudy weather. The leaves and stalks of grains * Lcucania uiiipuncta Haworth. Family Nocluida:,. Fig. 83.—Army-worm moth {Leucaniaunipuncta), pupa, and eggs in naturalposition in a grass-leaf. Natural size.(After Comstock.) INSECTS AFFECTING GRAINS, GRASSES, FORAGE 115
Size: 1572px × 1589px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
