Fourth Report on the Injurious and Other Insects of the State of New York: Made to the Regents of the University, Pursuant to Chapter 355 of the Laws of 1883 (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Fourth Report on the Injurious and Other Insects of the State of New York: Made to the Regents of the University, Pursuant to Chapter 355 of the Laws of 1883

The eggs are deposited on the twigs of plum trees in the autumn (october). They hatch at the putting out of the leaves the following spring. Three generations follow on the plum, of which the last only is winged, which at once migrates to the hop - yards. The fourth and the succeeding generations on the hop, to the eleventh inclusive, are Wingless females. The twelfth generation consists of winged males and females - the latter, agamic, and these return to plum trees in September. Here the thirteenth generation is composed of sexual Wingless females, which, after mating, deposit the eggs which are to hatch the following spring, in continuation of the species. For a detailed statement of the above, see a communication made by Mr. L. 0. Howard, of the Division of Entomology, under instructions from Professor Riley, in the Country Gentleman, for November 17, 1887, page 875, giving also the latest studies of Professor Riley upon the insect, made in England during the present autumn.

Now that the winter abode of the hop-aphis has been ascertained to be on plum trees, in the egg state, thereby, to a certain extent, bringing it within our reach (some entomologists are not yet willing to concede that it does not, in part, hibernate in the soil of hop yards), it may with propriety be claimed that the practical outcome of the investigation is very great. But it is to be feared that our worthy Commissioner of Agriculture, who has lent the aid of his department to this investigation, has been over sanguine in his announcement in his report of the present year, that there is now no reason why this pest, which last year damaged the crow to the extent of hundreds of thousands of dollars, should be longer feared by hop - growers.

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