| |
| Publication Type:
| Report |
|---|
| Author(s): | Vittum, P. J. |
|---|
| Author Affiliation: | Department of Entomology, Fernald Hall, University of Massachusetts, Amherst, MA 01003-2410 |
|---|
| Title: | Effect of date of application on efficacy of entomopathogenic nematodes against annual bluegrass weevils, golf course fairway, 1994 |
|---|
| Section: | Ornamentals
Other records with the "Ornamentals" Section
|
|---|
| Source: | Arthropod Management Tests. Vol. 20, 1995, p. 285. |
|---|
| Publishing Information: | Annapolis, MD: Entomological Society of America |
|---|
| # of Pages: | 1 |
|---|
| Abstract/Contents: | "Entomopathogenic nematodes (Steinernema carpocapsae formulated as Exhibit) were applied at a rate of 1 billion nematodes per acre on one of three dates (18 Apr, 2, or 16 May) to plots which were 20 ft wide and 80 ft long. Plots were replicated 4 times in a CRB design. The plots were established on a golf course fairway in Scarborough, NY consisting primarily of annual bluegrass (40%) and creeping bentgrass (60%) maintained at 0.5 inch mowing height. All materials were applied using a Toro boom sprayer set to deliver 50 gal/acre. The entire test area received 0.25 inch irrigation ca. 1 h after application on each date. Conditions at the time of application: 18 Apr - soil temp, 45°F, air temp, 72°F, water temp, 44°F, sunny, light breeze; 2 May - soil temp, 55°F; air temp, 60°F, water temp, 52°F, gusty NW wind (5-20 mph); 16 May - soil temp, 63°F, air temp, 72°F, water temp, 60°F, steady west wind (5-10 mph). Product efficacy was evaluated on 13 Jun by removing 12 cores (1.85 inch diam, 1.5 inch deep) from the left side of each plot and 12 cores from near the center of each plot and inspecting the cores under magnification in the Amherst laboratory. Insect counts were made by combining totals from 3 plugs per recorded observation (4 obeservations per plot, 20 observations per treatment). At the time of sampling, the population was 20% early instars (1st-3rd), 25% 4th instar, 45% 5th instar, and 10% pupae. None of the treatments was significantly different from the untreated control. Population reductions were in the range of 29 to 45%, well below the agronomically 'accepted' level of 70 to 80% control. Population pressure was moderate to high (116 larvae per sq. ft. in the untreated control), and all of the plots had populations above the currently accepted threshold of 30 to 50 weevils per sq. ft. While there have been indications that Steinernema carpocapsae can be effective against other species of weevils, this trial did not look encouraging. The first application date almost certainly was too early - the soil temperature was only 45°F and the water temperature was 44°F, well below the preferred temperature of the entomopathogenic nematodes. The second application date may have been less than ideal because most larvae were still in the grass stems at the time of that application and the nematodes may not have been able to locate their intended hosts. Several turf managers in the Northeast reported satisfaction with the performance of Exhibit against annual bluegrass weevils when they applied the material twice during the spring, at two to three week intervals, but this study indicates that a single application is not sufficient to significantly reduce weevil populations." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | Tables |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vittum, P. J. 1995. Effect of date of application on efficacy of entomopathogenic nematodes against annual bluegrass weevils, golf course fairway, 1994. Arthropod Manage. Tests. 20:p. 285. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=51874 |
| If there are problems with this record, send us feedback about record 51874. |
| Choices for finding the above item: |
|---|
| 
MSU catalog number: SB 951 .A1 I48 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
