Dispersion of Gipsy-Moth Larvæ By the Wind

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SCREEN EXPERIMENT CONDUCTED ON PLUM ISLAND, MASS., IN 1914.
April 14, 1914, a screen (PL III, fig. 2) was erected on the edge of the marsh near the Merrimac River. It was of the same size and proportions as that erected 1 mile farther north, at Salisbury Beach.
The slirubbery, composed mostly of beach plum, bayberry, wild rose, sumac, poplar, and wiUow, on the north end of the island, was ex- amined for egg clusters and these were creosoted. This practically obliterated the source of infestatio
...n to the eastward of the screen.
The location of the screen (PL III, fig. 2) was such that it was 2 miles from infested woodlands across the marshes and Merrimac River to the northwest, west, and southwest. Frequent examina- tions made it possible to determine the direction from which all the caterpillars came. It is not supposed that all the caterpillars caught during the time west winds prevailed came from the nearest infesta- tions (2 miles), but in some instances 5 miles or more. There was, however, a small infestation on a few roadside willows 1 mile to the southwest, but these were so thoroughly cleaned and tanglefooted in the spring that no caterpillars could be found on them during the dispersion season.


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