Downloaded from https://academic.oup.com/amt/article-abstract/22/1/52/4639780 by DeepDyve user on 21 July 2020 52 Arthropod Management Tests, Vol. 22 C: SMALL FRUITS BLUEBERRY (HIGHBUSH): Vaccinium corymbosum L., 'Bluecrop' S. Polavarapu and H. Peng (5C) Gypsy moth (GM); Lymantria dispar L Rutgers Blueberry and Obliquebanded leafroller (OBL); Choistoneura rosaceana (Harris) Cranberry Research Center, Redbanded leafroller (RBL); Argyrotaenia velutinana (Walker) Rutgers University Chats worth , NJ 08019 Tel: (609)726-1590 EVALUATION OF INSECTICIDES AGAINST LEPIDOPTEROUS PESTS DURIN G BLOOM ON BLUEBERRIES , 1996: This study was conducted in a 'Bluecrop' blueberry field near Whitesbog, NJ. Blueberry bushes were approximately 5 ft tall and spaced 9 X 4 ft apart. Treatments were arranged in a RCB design, replicated 5 times with each replication consisting of 6 bushes in 2 rows. Tw o unsprayed rows between blocks and 8 unsprayed bushes between treatments within a block served as buffers. Insecticides were applied with a C0 pressurized Model T backpack sprayer (R&D sprayers) equipped with a Tee Jet hollowcone (4 VS) nozzle calibrated to deliver 30 gal/acre at 40 PSI. Insecticides were applied twice on 14 May and 24 May ap proximately at 40 and 80% bloom, respectively. Spray adjuvants, Nu-Film 17 (4 oz/acre) and Latron B-1956 (0.12% v/v) were included in all B.t. and Confirm treatments, respectively. GM eggmasses were obtained from USDA-APHIS facility at Otis Air Base in Cape Code, MA, to augment larval pop ulations in the field plots. Eggmasses were stapled to the bush on 4 May at the rate of one eggmasses per bush. Eggmasses began hatching on 6 May and larvae were well distributed on the bushes within a week after hatching. Larval populations were assessed by sampling 25 clusters from each of 4 randomly selected bushes/replicate for a total of 100 leaf and flower clusters/replicate on 13 May (pretreatment count), and 24 May and 1 Jun (post-treatment counts). Leaf and flower clusters were randomly selected from the top, middle and bottom thirds of each bush. Pretreatment leafroller (OBL+RBL) and gypsymoth larval populations were not significantly different among the treatments. Post-treatment GM larval populations were significantly different from the untreated check in all insecticide treatments. Confirm provided the best overall protection against OBL, RBL and GM larvae throughout the study. Agree and both the Align treatments provided only a moderate control of leafrollers and GM. Leafroller populations primarily consisted of OBL (>90% ) larvae. No phytotoxicity was seen in any of the treatments. No. larvae per 100 clusters Rate 13 May 23 May 1 Jun Treatment Form./acre OBL+RBL GM OBL+RBL GM OBL+RBL GM 1.2bc 1.2d l.Oab 0.5cd Dipel DF 1.01b 3.4a 24.0a Agree WP 1.01b 0.8a 29.3a l.Obc 9.4b 3.0a 3.3b Able WP 1.01b 0.8a 28.2a 0.8bc 1.8cd 1.8ab 0.3d Crymax WDG 1.0a 22.0a l.Obc 2.0cd 1.5ab O.Od 0.75 lb Align EC 10.7 fl. oz 0.8a 18.0a 0.8bc 8.0bc 1.8ab 2.5bc Align EC 1.4a 31.2a 2.0ab 5.0bcd 1.8ab 1.5bc 21.4 fl. oz Confirm 70WP 0.36 lb 1.2a 26.8a 0.2c l.Od 0.0b O.Od Untreated Check 1.2a 28.6a 3.2a 27.4a 3.0a 12.3a Means within a column followed by the same letter are not significantly different (DMRT, P = 0.05). Data were transformed to sqrt (x + 0.5) before analysis.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 1997