Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Evaluation of Insecticides Against Dbm, 1995

Evaluation of Insecticides Against Dbm, 1995 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/98/4639976 by DeepDyve user on 21 July 2020 98 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS' No. DBM/10 plants Survey 3 (Aug 7) Survey 5 (Sept 5) 6 DAT 3 7 DAT 7 Early Late Early Late Treatment Rate/acre larvae larvae Pupae larvae larvae Pupae EXP 60720A 0.05 lb(AI) 0.58b 0.58b 0.28a 0.38c 0.30b 0.15c EXP 60720A 0.03 lb(AI) 0.58b 0.95b 0.25a 0.55bc 0.45b 0.18c Neemix + 7.0 oz. Xentari 0.5 lb. 1.30a 2.40a 0.05a 4.43a 5.33a 1.38b Xentari 0.5 lb. 0.88b 3.10a 0.18a 2.40ab 5.18a 1.75b Untreated Check 0.60b 2.47a 0.03a 4.85a 6.23a 2.95a Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.01). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. % Marketable heads Treatment Rate/acre 3 4 5 at harvest 1.40d 0.60d 90.0a EXP 60720A 0.05 lb(AI) l.OOe EXP 60720A 0.03 lb (AI) 1.75d 1.50d 1.23c 70.0b Neemix + 7.0 oz. Xentari 0.5 lb. 2.75c 3.20c 2.70b 22.5c Xentari 0.5 lb. 3.50b 3.70b 2.95ab lO.Od Untreated Check 5.00a 5.00a 3.28a O.Oe Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.01). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. CABBAGE: Brassica oleracea capitata 'Tastie' R. F. L. Mau and (19E) Diamondback moth (DBM); Plutella xylostella (L.) L. R. Gusukuma-Minuto University of Hawaii Dept. of Entomology 3050 Maile Way, Rm 310 Honolulu, HI 96822 (808) 956-7063 D. Dunbar Merck Research Laboratories 7555 N. Del Mar Ave. Fresno, CA 93711 R. S. Shimabuku Cooperative Extension Service 310 Kaahumanu Ave. Bldg21 4 Kahului, HI 96732 EVALUATION OF INSECTICIDES AGAINST DBM, 1995: The insecticides were evaluated at the Kula Research Station, Maui Agricultural Park, from July to September. The field was set up in a RCB design with six treatments and four replications (blocks). Each treatment plot measured 70 ft. by 7.5 ft. It consisted of four rows of cabbage on 36 in. centers and 18 in. in-row spacing. Adjacent rows were offset to allow equidistant plant spacing be­ tween rows. Treatment plots in each block were separated by a 4.5 ft. row spacing. Blocks were separated by a 10 ft. wide space that allowed sprayer ac­ cess. Total field size was 150 ft. by 109 ft. Treatments were applied using a tractor mounted with a PT O driven spray pump equipped with a 30 ft. boom. The boom was set with three banks nozzles that coincided with row spacing. Each group of nozzles had its own line from the main tank, therefore, spray output to specific treatment plots could be easily controlled by the sprayer operator. The first two treatments were applied using twin jet TJ 60-8006 noz­ zles at 25 psi with an output of 100 gpa. Thereafter, the pressures was increased to 45 psi to give an output of 125 gpa. The first treatment was made on 18 July, 5 days after transplanting. Subsequent applications were made on the following dates: 25 July, 1,8, 15, 22, and 29 Aug. A pre-treatment census for larvae was made the day before the first field spray application. Subsequent evaluations were conducted on a bi-weekly schedule. Ten plants were randomly selected from each treatment plot and carefully examined for larvae. DBM immatures were counted in separate age groups: early larvae, late larvae, and pupae. Early larvae were the first two instars which were identified by the black colored head capsules. The late larvae were the last two instars which were identified by body size and the green or brown head capsules. Pupae were easily identified by their net-like cocoons. Differences between the mean number of DBM larvae were noticed after the second survey. Both formulations of MK-244 provided the best over­ all control. Plants were relatively free of larval feeding damage and most of the heads were marketable at harvest. Although cabbage was harvested from the Mattch treated plots, many of the plants were extensively damaged. However, Mattch did provide better control than Thiodan 2 CO and Lannate LV the plants treated with which suffered greater of feeding injury. Downloaded from https://academic.oup.com/amt/article-abstract/22/1/98/4639976 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 99 Mean no. DBM/10 plants Survey 1 (July 13) Survey 2 (July 24) Pre-treatment 6 DAT 1 Early Late Early Late Treatment Rate/acre larvae larvae Pupae larvae larvae Pupae MK-244 0.16EC 6.0 oz. 0.00a 0.00a 0.0 0.15cd 0.03c 0.0 MK-244 5 SG 68.0 gm 0.00a 0.00a 0.0 0.08d 0.00c 0.0 Mattch 2.0 qt. 0.03a 0.03a 0.0 0.38bcd 0.38bc 0.0 Thiodan 2 CO 4.0 pt 0.00a 0.00a 0.0 0.56abc 0.68b 0.0 Lannate LV 3.0 pt. 0.00a 0.00a 0.0 0.83ab 1.85a 0.0 Untreated Check 0.00a 0.00a 0.0 0.95a 2.30a 0.0 Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. Mean no. DBM/10 plants Survey 3 (Aug Survey 4 (Aug 21) V) 6 DAT 3 6 DAT 5 Early Late Early Late Treatment Rate/acre larvae larvae Pupae larvae larvae Pupae MK-244 0.16 EC 6.0 oz. 0.58bc 0.70d 0.05a 0.08c 0.05c 0.08b MK-244 5 SG 68.0 gm. 0.08c 0.75d 0.08a 0.03c 0.10c 0.28b Mattch 2.0 qt. 1.15ab l.OOcd 0.00a 0.20bc 0.63bc 0.50ab Thiodan 2 CO 4.0 pt. 1.23ab 1.75bc 0.08a 0.33abc 1.23b 0.48ab Lannate LV 3.0 pt. 1.83a 3.28a 0.03a 0.80ab 4.28a 0.93a Untreated Check 2.33a 2.60ab 0.05a 0.80a 3.20a 0.50ab Means in each column followed by a different letter are significantly different (Tukey's range test P < 0.001). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. Mean no. DBM/10 plants Survey 5 (Sep 5) 7 DAT 7 Early Late % Marketable Treatment Rate/acre larvae larvae Pupae heads at harvest MD-244 0.16EC 6.0 oz. 0.03d 0.15c 0.03b 92.5a MD-244 5 SG 68.0 gm O.OOd 0.30c 0.10b 95.0a Mattch 2.0 qt. 1.18cd 2.48b 0.35b 45.0b Thiodan 2 CO 4.0 pt. 1.38bc 6.50a 1.55a 5.0c Lannate LV 3.0 pt. 4.43a 6.73a 2.58a 0.0c Untreated Check 2.73ab 5.58a 1.80a 0.0c Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001). DBM data were transformed by square root (X + 0.5) and percent marketability by arcsine transformation prior to analysis. Untransformed means are presented. (20E) CABBAGE: Brassica oleracea capitata L. 'Tastie' R. F. L. Mau and Diamondback moth (DBM); Plutella xylostella (L.) L. R. Gusukuma-Minuto University of Hawaii Dept. of Entomology 3050 Maile Way, Rm. 310 Honolulu, HI 96822 (808) 956-7063 R. S. Shimabuku Cooperative Extension Service 310 Kaahumanu Ave. Bldg. 214 Kahului, HI 96732 D. R. Colbert American Cyanamid 2133 Jackson Street Lodi, CA 95240 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Evaluation of Insecticides Against Dbm, 1995

Download PDF
2 pages

Loading next page...
 
/lp/oxford-university-press/evaluation-of-insecticides-against-dbm-1995-k66PafIb7D

References (0)

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.98
Publisher site
See Article on Publisher Site

Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/98/4639976 by DeepDyve user on 21 July 2020 98 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS' No. DBM/10 plants Survey 3 (Aug 7) Survey 5 (Sept 5) 6 DAT 3 7 DAT 7 Early Late Early Late Treatment Rate/acre larvae larvae Pupae larvae larvae Pupae EXP 60720A 0.05 lb(AI) 0.58b 0.58b 0.28a 0.38c 0.30b 0.15c EXP 60720A 0.03 lb(AI) 0.58b 0.95b 0.25a 0.55bc 0.45b 0.18c Neemix + 7.0 oz. Xentari 0.5 lb. 1.30a 2.40a 0.05a 4.43a 5.33a 1.38b Xentari 0.5 lb. 0.88b 3.10a 0.18a 2.40ab 5.18a 1.75b Untreated Check 0.60b 2.47a 0.03a 4.85a 6.23a 2.95a Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.01). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. % Marketable heads Treatment Rate/acre 3 4 5 at harvest 1.40d 0.60d 90.0a EXP 60720A 0.05 lb(AI) l.OOe EXP 60720A 0.03 lb (AI) 1.75d 1.50d 1.23c 70.0b Neemix + 7.0 oz. Xentari 0.5 lb. 2.75c 3.20c 2.70b 22.5c Xentari 0.5 lb. 3.50b 3.70b 2.95ab lO.Od Untreated Check 5.00a 5.00a 3.28a O.Oe Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.01). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. CABBAGE: Brassica oleracea capitata 'Tastie' R. F. L. Mau and (19E) Diamondback moth (DBM); Plutella xylostella (L.) L. R. Gusukuma-Minuto University of Hawaii Dept. of Entomology 3050 Maile Way, Rm 310 Honolulu, HI 96822 (808) 956-7063 D. Dunbar Merck Research Laboratories 7555 N. Del Mar Ave. Fresno, CA 93711 R. S. Shimabuku Cooperative Extension Service 310 Kaahumanu Ave. Bldg21 4 Kahului, HI 96732 EVALUATION OF INSECTICIDES AGAINST DBM, 1995: The insecticides were evaluated at the Kula Research Station, Maui Agricultural Park, from July to September. The field was set up in a RCB design with six treatments and four replications (blocks). Each treatment plot measured 70 ft. by 7.5 ft. It consisted of four rows of cabbage on 36 in. centers and 18 in. in-row spacing. Adjacent rows were offset to allow equidistant plant spacing be­ tween rows. Treatment plots in each block were separated by a 4.5 ft. row spacing. Blocks were separated by a 10 ft. wide space that allowed sprayer ac­ cess. Total field size was 150 ft. by 109 ft. Treatments were applied using a tractor mounted with a PT O driven spray pump equipped with a 30 ft. boom. The boom was set with three banks nozzles that coincided with row spacing. Each group of nozzles had its own line from the main tank, therefore, spray output to specific treatment plots could be easily controlled by the sprayer operator. The first two treatments were applied using twin jet TJ 60-8006 noz­ zles at 25 psi with an output of 100 gpa. Thereafter, the pressures was increased to 45 psi to give an output of 125 gpa. The first treatment was made on 18 July, 5 days after transplanting. Subsequent applications were made on the following dates: 25 July, 1,8, 15, 22, and 29 Aug. A pre-treatment census for larvae was made the day before the first field spray application. Subsequent evaluations were conducted on a bi-weekly schedule. Ten plants were randomly selected from each treatment plot and carefully examined for larvae. DBM immatures were counted in separate age groups: early larvae, late larvae, and pupae. Early larvae were the first two instars which were identified by the black colored head capsules. The late larvae were the last two instars which were identified by body size and the green or brown head capsules. Pupae were easily identified by their net-like cocoons. Differences between the mean number of DBM larvae were noticed after the second survey. Both formulations of MK-244 provided the best over­ all control. Plants were relatively free of larval feeding damage and most of the heads were marketable at harvest. Although cabbage was harvested from the Mattch treated plots, many of the plants were extensively damaged. However, Mattch did provide better control than Thiodan 2 CO and Lannate LV the plants treated with which suffered greater of feeding injury. Downloaded from https://academic.oup.com/amt/article-abstract/22/1/98/4639976 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 99 Mean no. DBM/10 plants Survey 1 (July 13) Survey 2 (July 24) Pre-treatment 6 DAT 1 Early Late Early Late Treatment Rate/acre larvae larvae Pupae larvae larvae Pupae MK-244 0.16EC 6.0 oz. 0.00a 0.00a 0.0 0.15cd 0.03c 0.0 MK-244 5 SG 68.0 gm 0.00a 0.00a 0.0 0.08d 0.00c 0.0 Mattch 2.0 qt. 0.03a 0.03a 0.0 0.38bcd 0.38bc 0.0 Thiodan 2 CO 4.0 pt 0.00a 0.00a 0.0 0.56abc 0.68b 0.0 Lannate LV 3.0 pt. 0.00a 0.00a 0.0 0.83ab 1.85a 0.0 Untreated Check 0.00a 0.00a 0.0 0.95a 2.30a 0.0 Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. Mean no. DBM/10 plants Survey 3 (Aug Survey 4 (Aug 21) V) 6 DAT 3 6 DAT 5 Early Late Early Late Treatment Rate/acre larvae larvae Pupae larvae larvae Pupae MK-244 0.16 EC 6.0 oz. 0.58bc 0.70d 0.05a 0.08c 0.05c 0.08b MK-244 5 SG 68.0 gm. 0.08c 0.75d 0.08a 0.03c 0.10c 0.28b Mattch 2.0 qt. 1.15ab l.OOcd 0.00a 0.20bc 0.63bc 0.50ab Thiodan 2 CO 4.0 pt. 1.23ab 1.75bc 0.08a 0.33abc 1.23b 0.48ab Lannate LV 3.0 pt. 1.83a 3.28a 0.03a 0.80ab 4.28a 0.93a Untreated Check 2.33a 2.60ab 0.05a 0.80a 3.20a 0.50ab Means in each column followed by a different letter are significantly different (Tukey's range test P < 0.001). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. Mean no. DBM/10 plants Survey 5 (Sep 5) 7 DAT 7 Early Late % Marketable Treatment Rate/acre larvae larvae Pupae heads at harvest MD-244 0.16EC 6.0 oz. 0.03d 0.15c 0.03b 92.5a MD-244 5 SG 68.0 gm O.OOd 0.30c 0.10b 95.0a Mattch 2.0 qt. 1.18cd 2.48b 0.35b 45.0b Thiodan 2 CO 4.0 pt. 1.38bc 6.50a 1.55a 5.0c Lannate LV 3.0 pt. 4.43a 6.73a 2.58a 0.0c Untreated Check 2.73ab 5.58a 1.80a 0.0c Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001). DBM data were transformed by square root (X + 0.5) and percent marketability by arcsine transformation prior to analysis. Untransformed means are presented. (20E) CABBAGE: Brassica oleracea capitata L. 'Tastie' R. F. L. Mau and Diamondback moth (DBM); Plutella xylostella (L.) L. R. Gusukuma-Minuto University of Hawaii Dept. of Entomology 3050 Maile Way, Rm. 310 Honolulu, HI 96822 (808) 956-7063 R. S. Shimabuku Cooperative Extension Service 310 Kaahumanu Ave. Bldg. 214 Kahului, HI 96732 D. R. Colbert American Cyanamid 2133 Jackson Street Lodi, CA 95240

Journal

Arthropod Management Tests – Oxford University Press

Published: Jan 1, 1997

There are no references for this article.