Insect pests of farm, garden and orchard . Fig. 307.—The asparagus miner {Agrornyza simplex Loew): at left, side viewof fiy; a, larva; b, thoracic spiracles; c, anal spiracles; d, puparium fromside; e, same from above; /, section of asparagus stalk showing injuryand location of puparia on detached section—a, e, much enlarged; /,slightly reduced. (After Chittenden, U. S. Dept. Agr.) to be the best means for controlling the pest from our presentknowledge of it, which, however, is still rather meager. has suggested that hitting a few stalks grow as a trap-crop to which the flies mig
Insect pests of farm, garden and orchard . Fig. 307.—The asparagus miner {Agrornyza simplex Loew): at left, side viewof fiy; a, larva; b, thoracic spiracles; c, anal spiracles; d, puparium fromside; e, same from above; /, section of asparagus stalk showing injuryand location of puparia on detached section—a, e, much enlarged; /,slightly reduced. (After Chittenden, U. S. Dept. Agr.) to be the best means for controlling the pest from our presentknowledge of it, which, however, is still rather meager. has suggested that hitting a few stalks grow as a trap-crop to which the flies might l)e lured, and then destroying thesestalks, might protect the cutting beds. CHAPTER XXIINSECTS INJURIOUS TO THE SWEET POTATO * The Sweet-potato Flea-beetle f As soon as the sweet-potato plants are set out they are oftenattacked by hordes of hungry little brownish flea-beetles. Smallchannels are eaten out of both surfaces of the leaf in a very char-acteristic manner, quite different from the woik of other flea-beetles (Fig. 309), an
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