. La radice di mais-worm. Radice di mais-worm; Spotted cetriolo beetle; il western corn rootworm; parassiti agricoli. Nemici naturali. Lo scarabeo è parasitized da un Tachinafly, Celatoria diabroticce Shimer (figura 2), che si sviluppa nel ventre del suo ospite. È predati dalla ruota bug, Arilus (Prionidus) cristatus Linn. e molti uccelli si nutrono in misura considerevole sui coleotteri. Esso è anche soggetto a una malattia batterica.1 rimedi. Per le root-worm l'uso di insetticidi sulla crescita del mais è imprac- ticable. Infatti, non siamo in grado di raggiungere la radice-stadio a vite senza fine a qualsiasi misura con veleni. Pertanto abbiamo

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. The corn root-worms. Corn root-worm; Spotted cucumber beetle; Western corn rootworm; Agricultural pests. NATURAL ENEMIES. The beetle is parasitized by a Tachinafly, Celatoria diabroticce Shimer (fig 2), which develops in the abdomen of its host. It is preyed upon by the wheel bug, Arilus (Prionidus) cristatus Linn., and many birds feed to a considerable extent on the beetles. It is also subject to a bacterial disease.1 REMEDIES. For the root-worm the use of insecticides on growing corn is imprac- ticable. In fact, we can not reach the root-worm stage to any extent with poisons. Therefore we must have recourse to farming methods. Injury in corn fields is most abundant when the seed has been planted in bottom lands, and if planting is necessary in such locations, it should be done late, in Georgia by the first of May, according to Quaintance; or attack may be so distributed that dam- age will be inconsequential by dropping eight or ten grains of seed corn in each hill. Of still more importance, however, is judicious crop rotation. Numbers of crops are not injured to any extent by the Southern corn root-worm, and of these are cotton, buckwheat, the smaller grains, and various garden vegetables other than beans and cucurbits. Experience will teach which of these can best be employed as -., , tj. • • 1 • i i ' j. i j. Fig. 2.— Celatoria diabroticce, fly para- alternates. It is inadvisable to plant site of corn r0ot-worm beetle-much squash and pumpkin to any extent in enlarged (original). rows between the hills of corn, more particularly in regions where injury by this species has been previously observed. For the beetle as it occurs on cucumber, squash, and other cucurbits the same remedies in use against the striped cucumber beetle should be pursued.2 In its occurrence on most other crops it can be controlled in the same manner as other leaf-beetles, for example, the Colorado potato beetle, by applying an arsenical alone or combined with Bordeaux mix- ture, th

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