Downloaded from https://academic.oup.com/amt/article-abstract/22/1/87/4639935 by DeepDyve user on 21 July 2020 Arthropod Management Tests, Vol. 22 87 E: VEGETABLE CROPS CABBAGE: Brassica oleracea capitata L. 'Gourmet' D. W. Bartels, (8E) Cabbage looper (CL); Trichoplusia ni (Hiibner) R. L. Hines, & W. D. Hutchison Imported cabbageworm (ICW); Artogeia rapae (L.) Department of Entomology Diamondback moth (DMB); Plutella xylostella (L.) University of Minnesota 219 Hodson Hall 1980 Folwell Ave. St. Paul, M N 55108 (612)624-367 0 CONTROL OF LEPIDOPTERAN PESTS IN CABBAGE, 1996: This study was conducted at the University of Minnesota Rosemount Agri cultural Experiment Station. Cabbage was transplanted bare-root on 28 Jun. Plots consisted of two 25 ft (7.6 m) rows on 40 inch (1.0 m) centers with plants spaced 13 inches (0.33 m) apart. Ten ft (3.0 m) borders and 10 ft (3.0 m) alleys separated plots. Treatments were arranged in a RCB design with 4 repli cations. Treatment applications were initiated during the 9-1 2 true leave stage, before precupping. Treatments were applied 26 and 31 Jul, 08 , 14 and 21 Aug using a moderate-clearance Spirit sprayer with 3 TX-10 hollowcone nozzles (1 overhead and 2 drop nozzles) per row. The sprayer was calibrated to deliver 27 gpa (252.5 liters/ha) at 47 psi (3.3 kg/cm ) and 3 mph (4.8 km/hr). Bond sticker/extender was added to all treatments (except Confirm treat ments) at a rate of 0.10 fl oz/gal (0.8 ml/liter). Counts were taken from 5 heads per plot on 15 Aug and 10 heads per plot on 26 Aug. Ten heads per plots were evaluated for feeding damage on 30 Aug using Green' s rating scale (J. Econ. Entomol. 1969 62:4 798-800) : 1 = no feeding damage; 2 = minor feed ing damage on the wrapper leaves (1 % eaten); 3 = moderate feeding damage on the wrapper leaves (2—5% eaten) with no head damage; 4 = moderate feed ing damage on the wrapper leaves (6-10% eaten) and minor feeding scars on the head; 5 = moderate to heavy feeding on the wrapper leaves (11-30% eaten) and moderate feeding scars on the head; 6 = >30 % of the wrapper leaves eaten and numerous feeding scars on the head. ICW was the dominant pest with populations exceeding 6 large ICW per plant by the 26 Aug sample date. DBM peaked early before treatment ap plications were initiated but declined to light levels for the remainder of the season. CL populations were low early, but increased to an average of 0.6 medium to large larvae per plant by 26 Aug. All treatments provided superior control of the three pest species and marketability ratings compared with the untreated check. No phytotoxicity was observed. Mean no."/5 heads (15 Aug) Mean no.<V10 heads (26 Aug) 30 Aug Rate Market Treatment lb (AI)/acre ICW CL DB M ICW CL DBM Rating Spinosad 2SC 0.0445 2.25 0.0a 0.25a 1.25a 0.25a 0.0a 1.18ab Spinosad 2SC 0.0890 2.0 0.0a 0.0a 1.75a 0.5a 0.0a 1.08a Confirm 2F + 0.125 4.25 0.25a 1.25a 3.25a 0.25a 4.75a 1.53b Latron CS-7 0.125% v/v<- Confirm 70W + 0.125 6.5 0.0a 1.25a 1.25a 0.0a 3.5a 1.25ab Latron CS-7 0.125% v/V 0.025 0.5a 0.0a 0.0a 0.0a 1.08a TD-2344-02 0.83E 4.25 0.0a TD-2344-02 0.83E 0.035 1.25 0.0a 0.5a 0.0a 0.5a 0.0a 1.03a Mustang 1.5EW 0.0a 0.0a 0.75a 0.5a 0.0a 1.18ab 0.0375 2.25 Mustang 1.5EW 0.05 2.5 0.0a 0.0a 0.0a 0.25a 0.25a 1.03a 0.0a 0.0a Pounce 3.2E 0.2 1.25 0.0a 0.5a 0.0a 1.03a Warrior IE 0.0a 0.0a 1.05a 0.025 2.5 0.0a 1.25a 0.0a 0.0a Sevin XLR Plus 4F 1.0 3.75 0.0a 0.25a 2.5a 1.25a 1.48ab Untreated Check 6.25b 12.25b 4.28c 8.25 1.5b 70.5b 6.0b NS Means within columns followed by the same letter are not significantly different (P 0.05); Ryan-Einot-Gabriel-Welsch multiple F test. NS nonsignificant ANOVA (P > 0.05). '•'No. includes all instars and pupae. 'Green's rating scale; see text. • Volume to volume ratio.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 1997