Full TGIF Record # 42344
Item 1 of 1
Publication Type:
i
Report
Author(s):Vittum, P. J.
Author Affiliation:Department of Entomology, University of Massachusetts, Amherst, MA 01003-2410
Title:Efficacy of several turf insecticides against Japanese beetle larvae, home lawn, 1995
Section:Ornamentals
Other records with the "Ornamentals" Section
Source:Arthropod Management Tests. Vol. 21, 1996, p. 363-364.
Publishing Information:Annapolis, MD: Entomological Society of America
# of Pages:2
Abstract/Contents:"Six turf insecticides were tested for efficacy against Japanese beetle larvae on a home lawn in Waltham, Mass. There were no Japanese beetle eggs or larvae present at the time of application, apparently because of low soil moisture conditions. The lawn consisted of 30% perennial ryegrass, 30% annual bluegrass, 30% crabgrass and 10% dandelion and was mowed at ca. 1.5 inches. Treatment plots were 8 ft x 8 ft, replicated 5 times, arranged in a RCB. All applications were made between 11:00 AM and 12:30 PM on 1 Aug 95. Liquid formulations were applied by hand with a watering can, 3 liters per plot. Granular formulations were applied using glass jars with perforated lids. Conditions at the time of application were as follows: air temp. 85°F, sunny and moderately humid with light SW wind (5-10 mph); soil type, silty loam; soil pH 6.6; water pH, 8.2. All plots were hand watered with 0.1 inch immediately after application, and an additional 0.2 inch was applied through overhead irrigation within 2 hr after application. No measuable rain fell in the area for 2 wk after application. Product efficacy was evaluated on 17 Oct (77 DAT) by removing 5 cupcutter plugs (4.25 inch diam) from near the center of each plot, dislodging soil with a hand trowel, and counting all grubs to a depth of 3 inches. None of the treatments reduced grub populations significantly relative to the untreated control. The trial site was under extreme agronomic stress, receiving only 0.4 inches rainfall between 20 June and 20 Aug. Supplemental irrigation was applied weekly beginning in late July to prevent the lawn from reaching the wilting point, but nearly 30% of the area went dormant or died even with irrigation. Apparently the low soil moisture present during most of Jul and Aug resulted in a delay in oviposition, so the early Aug application was premature. However, even long residual products like Merit failed to provide statistically significant reductions in grub populations, which were higher than expected (9.8 grubs/ft²) given the low soil moisture conditions. Because there were 77 days between application and evaluation, there may have been some recolonizing of treated plots- or there may have been some oviposition after residues of some products had deteriorated."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vittum, P. J. 1996. Efficacy of several turf insecticides against Japanese beetle larvae, home lawn, 1995. Arthropod Manage. Tests. 21:p. 363-364.
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