. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Flu. f)0.—llciul of plimt- louse, showing buck- ing bi'ivk—imic'li cii- largod (original. Divi- sion of Entomology). PLANT-LICE. Several forms of j^lant-lico ati'ect the loaves of sugar beet, l)ut as far as at present known do not iniliet extensive injnrv. Among the plant- liee, however, are some few forms Avhich have tlie hal)it of feeding on the roots, Ix'ing known as root-liee, and these arc of the greatest inipoi'tanc(». when atmospheric conditions conduce to tiicir (h»\'cloi)mcnt or the i)iants arc in
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Flu. f)0.—llciul of plimt- louse, showing buck- ing bi'ivk—imic'li cii- largod (original. Divi- sion of Entomology). PLANT-LICE. Several forms of j^lant-lico ati'ect the loaves of sugar beet, l)ut as far as at present known do not iniliet extensive injnrv. Among the plant- liee, however, are some few forms Avhich have tlie hal)it of feeding on the roots, Ix'ing known as root-liee, and these arc of the greatest inipoi'tanc(». when atmospheric conditions conduce to tiicir (h»\'cloi)mcnt or the i)iants arc injured through other causes. THE MELON PLANT-LOTTSE. (Aj> (joxxi/jdl. (.i ]o\.) The melon plant-louse or, as it is more commonly known, the melon louse, is perhaps the commonest species found on l)eets, and is the best known as well as most destructive of all insects of this class. Fortunately for the beet grower it does not favor this crop, and is usually found only in moderate numbers on beets when othei- plants are available. The writc^" has sihmi a considerable number of this species on beet leaves working in their usual manner by pumping up the juices through their beaks (tig. r)(i), l)ut although tlie plants were carefully watched the operations of the plant-lice did not seem to hinder the growth of the plants in any degree. Neverth(dess, this louse is capa- ble of serious damage, more especially in the cn'ent of exh:nistion of favorite host i)lants, like melons and other cucurbits, which would drive it to beets if these were most availal)le. The prinei})al forms of this insect are illustrated in figure 57. The melon louse is i)ro])al)ly ol' American origin and perluips tropical, /U^\ since it prefers plants of a trapiciij \^^j ] nature, has a very wide distribution ' -^ in North and South America and the West Indies, and has been observed in Australia. It is therefore apt to be present in most lields of sugar beet, but its occurrence there can usually be
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