Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 rilE INSECT WORLD. 297 pale clay-yellow, with a narrow, silver-gray margin to the outer edge of the fore-wing. There is also a dusky stripe through its centre, surmounted by a white streak, which gives the specihc name a/bilinea, or 'white lined.' Practical measures against this in- sect are difficult. Where the stage of the grain warrants it in any way, the best thing is to cut it at once. This will save
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 rilE INSECT WORLD. 297 pale clay-yellow, with a narrow, silver-gray margin to the outer edge of the fore-wing. There is also a dusky stripe through its centre, surmounted by a white streak, which gives the specihc name a/bilinea, or 'white lined.' Practical measures against this in- sect are difficult. Where the stage of the grain warrants it in any way, the best thing is to cut it at once. This will save further injury, and the insects will distribute themselves to localities where their mischief will not count so heavily. As with the previous species, increase is depend- ent upon conditions which we do not entirely understand, and here also the parasites ordinarily obtain control before the year is out. The wandering habit is somewhat developed in this species as well, and frequently they start in grass lands and emigrate to adjacent grain-fields when the wheat-heads are well advanced. An insect somewhat similar in appearance in the caterpillar stage is the 'fall army-worm,' Laphygma fnigipcrda. It is smaller, however, the head dark with a prominent, white, V-mark, while the lines are different and the body is covered with rather well marked black tuber- cles, giving rise to short, stiff, black hair. The creature is a general feeder, and appears in greatest num- bers late in the season in fields of dense vegetation of almost any kind not differ much from the species already described, and, like them, it goes underground to pupate. There are always two, The wheat-heaii army-worm.— a, a, eating out a liead of grain ; b, eggs under a leaf sheath ; enlarged at c, d; the moth, Leiicania albilinea, surmounting all. In general habits it does
Size: 816px × 2451px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
