Abundance Of Stink Bugs Research Articles

Evaluation of Insecticides for Suppression of Rice Stink Bug on Sorghum,1996

Abstract Two pyrethroids, 2 organophos-phates, and a chloro-cyclodiene were evaluated for rice stink bug control at the Texas Agricultural Experiment Station Research Farm near College Sta-tion, TX. Seed of hybrid sorghum (ATX399 X RTX430) was planted 10 Jun on rows spaced 30 inches apart. Insecticide treatments were compared in plots, 4 rows X 40 ft long, arranged in a RCB design with 4 replications. Insecticides were applied to the middle 2 rows of plots when sorghum was in the dough stage. Insecticides were applied on 28 Aug between 0800 and 0900 h CDT by using a hand-held backpack sprayer with TX-3 hollow cone nozzles at 35 psi, producing a finished spray volume of 4.9 gpa. Stink bug abundance was assessed by using the “ beat bucket” technique to sample 10 panicles per plot. A pre-treatment count of rice stink bug nymph and adult abundance was made 2 d before insecticides were applied. About 3.5 inches of rainfall occurred over a 2-d period beginning 6 h after treatment. Post-treatment counts were made on 29 Aug (1 DAT) and 31 Aug (3 DAT). Data were statistically analyzed by using ANOVA and LSD. Percent control was calculated by using the Henderson and Tilton (1955) sampling formula.

Relationship Between Soybean Maturity Group and the Phenology and Abundance of Stink Bugs (Heteroptera: Pentatomidae): Impact on Yield and Quality

Soybean, Glycine max (L.) Merrill, varieties in maturity groups IV–VIII were sampled weekly for stink bugs from mid-June to mid-October in 1993 and 1994. Plots were either treated with tralomethrin to control stink bugs or left untreated to measure yield and seed quality losses to the pests. In 1993, stink bug populations peaked at 8.3 per 25 sweeps in the Group IV NK S4884 in late-August, 6 wks after the R4 growth stage (full pod without seeds). As they were declining in the Group IV soybean, populations were rapidly increasing in the later-maturing varieties, reaching population peaks 5 to 6 wks after R4 in all maturity groups. Population peaks in the later-maturing varieties were higher than in the maturity groups IV and V. Similar seasonal population distributions were observed in 1994, although populations peaked 4 to 6× higher than in 1993. Both Nezara viridula (L.) and Acrosternum hilare (Say) were common in 1993 when populations were relatively low. In 1994, N. viridula was the most abundant species. Euschistus seruus (Say) was present at low population densities both years. Tralomethrin treatments significantly decreased the stink bug damage to seeds. Seed weights and yield also were higher in the treated plots of most varieties. Significant correlations occurred for stink bug population peaks with percentage kernel damage, yield reductions and 100-seed weight reductions.

Evaluation of Insecticides for Suppression of Stink Bugs on Sorghum, 1995

Abstract Three pyrethroids and 2 organophosphates were evaluated for stink bug control at the Texas Agricultural Experiment Station Research Farm near College Station, TX. Seed of hybrid grain sorghum (ATx399 X RTx430) was planted 15 Jun on rows spaced 30 inches apart. Insecticide treatments were compared in plots, 4 rows X 30 ft long, arranged in a RCB design with 4 replications. Insecticides were applied to the middle 2 rows of plots when sorghum was in the soft-dough stage. Insecticides were applied on 2 Sep between 0800 and 0900 h CDT by using a hand-held backpack sprayer with TX-3 hollow cone nozzles at 35 psi, producing a finished spray volume of 4.9 gpa. Stink bug abundance was assessed by using the “beat bucket” technique to sample 20 panicles/plot. A pre-treatment count of RSB and SGSB nymph and adult abundance was made the day before insecticides were applied. Post-treatment counts were made on 3 Sep (1 DAT) and 5 Sep (3 DAT). Data were statistically analyzed by using ANOVA and LSD. The % control was calculated by using the Henderson and Tilton (1955) sampling formula.

Relative Abundance of Stink bugs (Hemiptera: Pentatomidae) in Southwestern Colombia Rice Fields

Relative abundance of stink bugs was determined from 01 May 1989 to 30 September 1992 in 80 commercial rice fields in Colombia and in 12 selected rice-producing countries of Latin America. Fifteen stink bug species from nine genera were found in Colombia. The species are Oebalus ornatus (Sailer), Mormidea maculata Dallas, Tribraca obscurata Bergroth, M. pictiventris Stål, O. pugnax torridus (Sailer), Proxys punctulatus (Palisot de Beauvois), O. insularis (Stål), T. limbativentris Stål, and O. ypsilongriseus (De Greer). In Valle del Cauca Department in southwestern Colombia, the most abundant species was O. ornatus representing 94.1% of the stink bugs collected. Seven species comprised the remaining 5.9%. Oebalus ornatus and O. ypsilongriseus were recovered from seven Latin America countries and had the widest geographical range of the stink bugs species collected during the study.

Species Composition and Seasonal Abundance of Stink Bugs (Heteroptera: Pentatomidae) in Southern Florida Rice

Stink bugs were sampled with sweep nets in eight southern Florida rice fields during 1983 and 1984. Four stink bug species were found; of these, Oebalus pugnax (F.), composed >95% of the total population. Stink bugs were found continuously in rice fields from June through November. Population densities increased rapidly in rice fields at heading and were most abundant during the grain-filling period in both main and ratoon crops. Populations increased rapidly in fields because of adult migration and egg hatch. Populations of stink bugs greater than economic threshold levels were found in 50% of the main-crop and 100%of the ratoon-crop fields studied.