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| Web URL(s): | http://archive.lib.msu.edu/tic/mitgc/article/1989115.pdf
Last checked: 02/27/2009
Requires: PDF Reader |
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| Publication Type:
| Proceedings |
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| Author(s): | Davis, M. G. Kortier;
Smitley, D. R. |
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| Author Affiliation: | Dept. of Entomology, Michigan State University |
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| Title: | Feeding preferences of chinch bugs for fine fescue and Kentucky bluegrass |
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| Meeting Info.: | East Lansing, MI: January 16-18, 1989 |
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| Source: | Proceedings of the 59th Annual Michigan Turfgrass Conference. Vol. 18, 1989, p. 115-118. |
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| Publishing Information: | East Lansing, MI: Michigan State University |
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| # of Pages: | 4 |
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| Keywords: | TIC Keywords: Risk assessment; Blissus; Fine fescues; Feeding preferences; Poa pratensis; Thatch
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| Abstract/Contents: | Studied the relationship between chinch bugs and the turfgrass environment. Of the many variables surveyed thatch thickness and turf species appeared the most promising for predicting chinch bug populations. Data was collected from 107 lawns, from 1986 to 1988, in the Lansing area, 44 with chinch bugs and 63 without. Chinch bug abundance was determined as the sum of five transects, each measuring 5'x1". Thatch thicknesses were measured at five randomly selected sites on each lawn. Chinch bugs infested lawns averaged 9 mm thatch thickness. Uninfested lawns averaged 5 mm thatch. Percentage plant species in each lawn was determined by dividing the number of plants in a sample by the total number of plants sampled (50). Chinch bugs prefer lawns with more fine fescue and less Kentucky bluegrass. Infested lawn's average composition was 42% kentucky bluegrass and 35% fescue. Uninfested lawn's average composition was 64% Kentucky bluegrass and 12% fescue. The researchers presented a simple method for predicting the probability of chinch bug infestation. As the number of criteria are met, the probability of chinch bug infestation increases. Is the thatch thickness greater than 8 mm? Is Kentucky bluegrass between 10-50% of the lawn? Is fine fescue greater than 30% of the lawn? If no criteria are met, then the percent risk of chinch bug infestation is 19%. If 1, then 50%. If 2 then 63%. If 3, then 88%. Does the chinch bug prefer to feed on fescue in lawns? A feeding study determined this. Several observation chambers were built in which there was one fescue plant and one kentucky bluegrass plant on which the chinch bug could feed. Three different cultivars of each type were tried, so there were nine different chamber types. Each chamber type was replicated five times, for a total of 45 chambers per run. A single chinch bug was put into each chamber. Every 15 minutes for the next 7 hours the chinch bug was observed, and whether it was nibbling one plant or the other, or neither, was recorded. The experiment was run twice for a total of 90 bugs observed. 60% fed solely on Kentucky bluegrass. 8% fed on fine fescue. 24% fed on both. 8% did not feed. Of those that fed on both, more time was spent on the Kentucky bluegrass, an average of 9.1 vs 1.6 feeding observations. It may be that the bugs prefer the thatchiness of fine fescue, but prefer to feed on Kentucky bluegress. |
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| Language: | English |
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| References: | 2 |
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| Note: | Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Davis, M. G. K., and D. R. Smitley. 1989. Feeding preferences of chinch bugs for fine fescue and Kentucky bluegrass. p. 115-118. In Proceedings of the 59th Annual Michigan Turfgrass Conference. East Lansing, MI: January 16-18, 1989. East Lansing, MI: Michigan State University. |
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| Web URL(s):
http://archive.lib.msu.edu/tic/mitgc/article/1989115.pdf
Last checked: 02/27/2009
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 M47 |
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