Full TGIF Record # 19696
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Author(s):Potter, D. A.; Gordon, F. C.
Title:Susceptibility of southern masked chafer eggs to heat and drought stress in turfgrass
Source:Kentucky Turfgrass Research. 1983, p. 30.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Keywords:TIC Keywords: Cyclocephala lurida; Drought stress; Laboratory tests; Field tests; Irrigation; Grubs; Soil moisture; Heat stress; Survival
Abstract/Contents:1983 laboratory and field stress on survival of masked chafer eggs and larvae, and on female egg laying in turf. In the laboratory, eggs of different ages were exposed for varing lengths of time to realistic drought conditions (i.e., 6.8% soil moisture, 98% relative humidity). Exposure periods of 24 hours at 33 degrees Celsius or 72 hours at 25 degrees Celsius resulted in complete mortality of newly-laid eggs. This indicates that even brief exposure to drought conditions could result in widespread mortality. Eggs were most vulnerable to drought during the first two days after being laid. The minimum soil moisture content at which eggs could develop was about 11%. In field tests, eggs were buried at different depths in plots that were either irrigated regularly or left unwatered. The severe summer drought of 1983 resulted in upper soil temperatures as high as 37-43 degrees Celsius (99-109 degrees Fahrenheit) in the non-irrigated plots, with soil moisture dropping to less than 8%. Conditions in the irrigated plots were more moderate. None of the implanted eggs survived in the non-irrigated plots. In addition, female beetles would not lay eggs in the drought-stressed turf, and implanted first-instar grubs could not survive. Egg-laying, and egg and grub survival were high in the irrigated turf. These results support the hypothesis that in dry summers, wide-spread mortality of masked chafer immatures may occur. It appears that female beetles preferentially lay their eggs in watered turf. This may explain why in 1983, golf course fairways and irrigated lawns suffered severe grub problems, while non-irrigated areas were relatively grub-free.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Potter, D. A., and F. C. Gordon. 1983. Susceptibility of southern masked chafer eggs to heat and drought stress in turfgrass. KY. Turfgrass Res. p. 30.
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