. Annual report. Entomological Society of Ontario; Insect pests; Insects. 96 REPORT OF THE ENTOMOLOGICAL A. Light. According to Arnott (1952), the weevils are positively phototropic. In his report no mention was made of any crepuscular or nocturnal activity. Figures 1 and 2 indicate that the number of hours of sunshine each dav had no apparent effect on the weevil population, either while on vegetation or in flight. B. Precipitation. Chapman (1931) stated, "Heavy precipitation may act directly by mechanically removing certain insects from their host plants". M. picirostris adults, wi
. Annual report. Entomological Society of Ontario; Insect pests; Insects. 96 REPORT OF THE ENTOMOLOGICAL A. Light. According to Arnott (1952), the weevils are positively phototropic. In his report no mention was made of any crepuscular or nocturnal activity. Figures 1 and 2 indicate that the number of hours of sunshine each dav had no apparent effect on the weevil population, either while on vegetation or in flight. B. Precipitation. Chapman (1931) stated, "Heavy precipitation may act directly by mechanically removing certain insects from their host plants". M. picirostris adults, with the slightest disturbance of foliage or blossoms, tend to fall off the host plant. The summer of 1951 was wet while that of 1952 was dry. During the period in 1952 when' the weevils were moving into the alsike in large numbers, no rain fell. Consequently, any effect that rainfall might have had on weevil activity could not be studied. In 1951, population figures were recorded before and after rainstorms. These are given in Table It. In each case, sweeping was done as soon after the rainfall as the foliage was reasonably dry, by the same person, and with the same insect net. Populations, with one exception, were reduced after each rainfall. The exception occurred the day before the peak of population was reached. At this time, the weevils were moving continuously into the alsike field in such large numbers that any decrease that might have been caused by the slight rain could have been more than offset by the arrival of other weevils. KEITH FARM 1952. SATURATION DM IC (IMC Y. 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
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
