. Cranberries; : the national cranberry magazine. Cranberries. Dearness Scale, A Vine Pest of Cranberry: Bionomics and Spatial Distribution (Lontinuation oj a ^^enes) by J. O. Jackson and C. F. Koval, University of Wisconsin, Madison, Wisconsin Preliminary laboratory observa- tion based on 140 gravid females dissected in lots-of 10 each day for 14 days indicates that approxi- mately 10% of eggs per female remain unhatched after two weeks (Fig. 5). From these results, initial hatch up to 50 percent occurs in five days. However, it remained at approximately 50 percent between days 5 and 12, duri
. Cranberries; : the national cranberry magazine. Cranberries. Dearness Scale, A Vine Pest of Cranberry: Bionomics and Spatial Distribution (Lontinuation oj a ^^enes) by J. O. Jackson and C. F. Koval, University of Wisconsin, Madison, Wisconsin Preliminary laboratory observa- tion based on 140 gravid females dissected in lots-of 10 each day for 14 days indicates that approxi- mately 10% of eggs per female remain unhatched after two weeks (Fig. 5). From these results, initial hatch up to 50 percent occurs in five days. However, it remained at approximately 50 percent between days 5 and 12, during which time variation in hatch among females is greatest. As egg hatch nears comple- tion at 14 days, this variation becomes less. The prolonged hatch- ing time for each female scale gives the scale population the advantage of an extended emergence period, so that elimination of the popula- tion due to single catastrophic event ( frost, flood, insecticide) is avoided. Emergence in late August by winged males was first observed in Massachusetts Aug. 20-24 in 1925 by Lacrobc (1926). In Wisconsin, male flight was first observed on , Aug. 23 in 1973 and 1974. In 1975 sticky board traps, 35 square in. each, placed in the infested area indicated that male flight began between Aug. 20-23 (Fig. 6) at both Millston and Valley Junction marshes. Peak male activity occur- miLUIUH H IVtLLEY iCT. B 20- 23- 26- 29- 95% CONFIDENCE LIMITS J so-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Portland, CT [etc. ] : Taylor Pub. Co. [etc. ]
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