. Relazione annuale della fondazione del Museo Statale di Storia Naturale per l'anno ... La scienza; musei. Relazione dello Stato entomologo. 153 sulle rive dei fiumi, prati e ricca di boschi ombreggiati del Sud e Stati occidentali, e talvolta noto come "wild segala". Isosoma vitis Saunders*, noto come il "uva- seme di insetto," la larva di cui, rappresentata in dimensione naturale ed in ingrandimento in fig. 13, alimenta entro i semi delle uve prima della maturazione, causiuer frutto a inaridirsi e fail di maturazione. Fig. 13.-larva dei vinaccioli midge, ISOSOMA YITIS. Rimedi. È per

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. Annual report of the Trustees of the State Museum of Natural History for the year ... Science; Museums. Report of the State Entomologist. 153 river banks, meadows, and rich shaded woods of the Southern and Western States, and sometimes known as "wild rye." Isosoma vitis Saunders, * known as the "grape- seed insect, " the larva of which, represented in natural size and in enlargement in Figure 13, feeds within the Seeds of grapes before the ripening, causiuer the fruit to shrivel and fail of maturing. Fig. 13.—Larva of the grape-seed midge, ISOSOMA YITIS. Remedies. It is fortunate that we have at our command means for controlling the depredations of this insect, which are simple, easy, and inexpensive. Since its entire life, from its hatching to its emerging in its perfect state, is passed within the straw and in quite a limited locality therein, it is evident that if the straw be destroyed by burning, or by any other as effectual a method, at any time prior to the emerging of the winged insect, the entire brood will be destroyed with it. If the grain is not cut unusually close, a large proportion of the' larvse will be left in the stubble The stubble of an infested field should be burned over at any convenient time favorable for the burning. There is not the objection to this expedient in this case, that may properly be urged against burning for the Hessian fly—that it destroys the many parasites which ren- der such excellent service in reducing its numbers — for the known parasites of the joint-worm are but few, and thus far they have proved of but little value in its reduction. Dr. Harris has justly remarked: " We need not be restrained by the consideration that the, diseased straw contains also some truly parasitical larvse ; for these are very few in number compared with the immense swarms of the Uurytoma [Isosoma] that are annually produced. If we can succeed in exter- minating these destroyers, we shall have no occasion for the s

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• bookcentury1800
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