. Annual report. Entomological Society of Ontario; Insect pests; Insects. 46 THE REPORT OF THE. «• I* 24 3 13 23 2 6 10 •JULY AUGUST SEPT. hg. 1—Longevity of Plum Leafhopper Length of Life.—In 1936 adults confined in lantern globe cages on peach seedlings lived from 2 to 66 days, the average of 136 individuals being 20 days. In this season one leafhopper lived until September 25 in the cages, but we were unable to find adults on the trees after September 1. During the following season leaf hoppers survived as long as two months on potted plums but all had died by September 6. The accompanying
. Annual report. Entomological Society of Ontario; Insect pests; Insects. 46 THE REPORT OF THE. «• I* 24 3 13 23 2 6 10 •JULY AUGUST SEPT. hg. 1—Longevity of Plum Leafhopper Length of Life.—In 1936 adults confined in lantern globe cages on peach seedlings lived from 2 to 66 days, the average of 136 individuals being 20 days. In this season one leafhopper lived until September 25 in the cages, but we were unable to find adults on the trees after September 1. During the following season leaf hoppers survived as long as two months on potted plums but all had died by September 6. The accompanying graph (Text fig. 1) illustrates the length of life of plum leaf hoppers in insectary cages during the 1937 season. The mortality rate for two years is given below (Table V). Table V—Mortality of Adults 1936 1937 25% of adults dead by . . .. July 14 July 25 50% of adults dead by . . .. July 22 Aug. 10 75% of adults dead by ... .Aug. 16 Aug. 19 90% of adults dead by . . .. Aug. 24 Aug. 30 95% of adults dead by ... .. Sept. 1 Sept. 3 100% of adults dead by . .Sept. 25 Sept. 6 JAM". FEB. MAR APR. MAY 19 JUNE 8 JULY AUG. SEPT OCT NOV. DEC. HftTCHl NG OF E&GS 19 17 NYMPHS 6 i ADULTS . 19 J NTER m e Fig. 2 Life History of Plum Leafhopper Life History Summary.—There is but one generation in a year, with the insect passing the winter in the egg stage. Eggs commence hatching about. 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 Entomological Society of Ontario; Ontario. Dept. of Agriculture. Toronto, The Society
Size: 2434px × 1027px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
