Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 214 A A' £CO/VOM/C ENTOMOLOGY. follows shortly thereafter, resulting in a fall supply of beetles, which, as a rule, hibernate. Sometimes a third partial brood of larvae reaches the pupal state, and hibernates in that condition. The arsenites are well-known and approved remedies, used at the rate of one ])ound in from seventy-five to one hundred gallons of water, and several machines especially intended for spraying potato-fields are on t
Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 214 A A' £CO/VOM/C ENTOMOLOGY. follows shortly thereafter, resulting in a fall supply of beetles, which, as a rule, hibernate. Sometimes a third partial brood of larvae reaches the pupal state, and hibernates in that condition. The arsenites are well-known and approved remedies, used at the rate of one ])ound in from seventy-five to one hundred gallons of water, and several machines especially intended for spraying potato-fields are on the market. The insect maintains itself uncheckefl, because, while active war is waged against the first Fig. 206. \ I- d MJf^ e The Colorado potato-beetle, Dorvp/iora lo-lineata.—a, a, egg patches ; 6, i>, d, larvae in different stages of growth ; c, pupa; rf, beetle; e, its elytra enlarged. brood, little attention is paid to the second, and this is usually allowed to mature and provide for a new crop the year following. Spraying should be done first as soon as the beetles begin feed- ing, to prevent oviposition if possible ; it should be done a sec- ond time when larvae appear generally, and it should be done as often thereafter as beetles or larvae are noticed infesting the plants. The species of Diabrotica are rather slender, with long an- tenna^ ; of a green or yellow color, with black spots or stripes. The adults feed on leaves, flowers, or pollen, but the larvae, which are white and slender, usually feed in the roots or stems of plants. One of our most common forms, D. vittafa, is known as ' the striped cucumber-beetle,' and is yellow with black stripes on the
Size: 1790px × 1118px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
