| Autor: |
Toews, Michael D., Greene, Jeremy, Reay-Jones, Francis P. F., Reeves, Richard B. |
| Zdroj: |
Proceedings of the Beltwide Cotton Conferences; 2008, p1193-1203, 11p |
| Abstrakt: |
Common sampling methods for stink bugs in Georgia cotton were compared in commercial cotton fields ranging from 15 to 25 acres. Seven grower-owned fields, located in Tift and Colquitt counties, were scouted weekly starting when quarter sized soft bolls were available and ending when bolls were too hard to squeeze by hand. At a density of one sampling site per acre in each field, we compared 50 sweeps with a 15-inch sweep net, shaking 12-linear feet of row over a white drop cloth, and dissection of 20 soft bolls. Bolls were collected in plastic bags and brought to the laboratory where they were dissected for symptoms of internal feeding damage including warts, stained lint, and boll rot. Although acquisition of 20 bolls required only 2:05 minutes, subsequent dissection of these bolls required an additional 5 minutes making this the most time intensive sampling method. Fifty sweeps required 1:37 minutes while shaking 12-feet of row on a drop cloth required 1:07 minutes. Although it was more time consuming to process the bolls compared with sweep net or drop cloth samples, boll samples were 10-fold more sensitive at detecting positive hits (boll damage compared with detecting individual insects). The sample variance to mean ratio showed that boll damage and insect presence were aggregated across the fields. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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