Access the full text.
Sign up today, get DeepDyve free for 14 days.
Downloaded from https://academic.oup.com/amt/article-abstract/22/1/68/4639847 by DeepDyve user on 21 July 2020 D: CITRUS, NUTS , AN D AVOCADOS Arthropod Management Tests, Vol. 22 67 30 Oct. Rate % fruit surface % rejected Treatment/Formulation form/acre russeted (2) fruit Nexter 75 WP 0.315 lb AI 4e 19def Nexter 75 W P 0.5 lb AI lOcd 29bcde Nexter75WP + Petroleum oil FC435-66 1 gal 13c 33bc Nexter 75 W P 0.315 lb AI + Petroleum oil FC435-66 5 gal lOd 31 bed Nexter 75 WP 0.315 lb AI + Petroleum oil FC435-66 10 gal 17b 39 ab Nexter 75 W P 0.5 lb AI + Petroleum oil FC435-66 5 gal 8d 28bcdef Nexter 75 WP 0.315 lb AI + Petroleum oil FC435-66 5 gal + Copper hydroxide 50 W P 4 lb metallic 4e 16ef Petroleum oil FC435-66 1 gal 17b 41ab Petroleum oil FC435-66 5 gal 17b 41ab Petroleum oil FC435-66 10 gal 18b 41ab Agri-mek0.15EC 10 oz + Petroleum oil FC435-66 5 gal + Copper hydroxide 50 W P 4 lb metallic 2e 14f Untreated — 26a 53a Means in a column followed by the same letter are not significantly different (P = 0.05; WD). ORANGE: Citrus sinensis (L.) Osbeck 'Valencia' C. C. Childers, M. Harvey, and D. K. Threlkeld (11D) Thrips; Frankliniella bispinosa (Morgan) University of Florida, IF A S Citrus Research and Education Center 700 Experiment Station Road Lake Alfred, Florida 33850 Telephone (941) 956-1151 EVALUATION OF SEVIN AND LORSBAN FOR THRIPS CONTROL ON CITRUS DURING BLOOM, 1996: Two Sevin formulations were compared against Lorsban for controlling adults and larvae of Frankliniella bispinosa. Treatments were assigned to 8 rows wide X 12 trees/row ( = 96 tree) to 8 rows X 13 to 21 trees/row ( = 150 tree) plots in a RCB design, replicated 4 times on 12-18 ft tall trees with 15 X 25 ft spacing. Treatments were applied on 25 and 26 Mar using a Rears PTO airblast sprayer with speed, nozzling and pressure adjusted to apply 200 gpa. At each evaluation date, 20 open flowers were randomly collected from at least 5 trees in the center of each replicate. Each flower was picked individually and placed immediately in a one pint jar containing ca. 100 ml of 70% ethanol. The jars were returned to the laboratory and the number of open flowers were recorded per jar. In dividual flowers per ja r were teased apart to expose and flush thrips motile stages from the areas between petals, filaments and the pistil. The numbers of both F. bispinosa adults and larvae per 20 open flowers were recorded as one observation. Data were subjected to log (X + 1) transformations for statis 1 0 tical analysis and untransformed means are presented in the tables for comparison. Both Sevin formulations provided only short-term control (3-5 d) of adult thrips compared with the Lorsban treatment that provided at least 6 d con trol through 1 Apr. Adult numbers in the Lorsban treatment were significantly lower than the untreated check through 4 Apr. Thrips larvae within the flow ers were not killed by either formulation of Sevin or Lorsban immediately following spray application. Delayed reductions in larval numbers were recorded in all three insecticide treatments between 2-8 Apr. The insecticides either disrupted oviposition or killed emerging larvae following eclosion or both. The net result was sustained lower numbers of larvae being recovered from insecticide treated blocks through 8-10 Apr. This further demonstrates the impor tance of proper timing of the insecticidal application during bloom to effectively suppress F. bispinosa activity in developing floral buds and open flowers. Downloaded from https://academic.oup.com/amt/article-abstract/22/1/68/4639847 by DeepDyve user on 21 July 2020 68 Arthropod Management Tests, Vol. 22 D: CITRUS, NUTS, AND AVOCADOS Rate Spray Treatment/Formulation form/acre 27 Mar 28 Mar 29 Mar 4 Apr date Pre-spray 1 Apr 2 Apr 8 Apr 10a li b 19b Sevin XLR 4 L 5q t 26 Mar 99a 94a 223a 440a 480a 4b 17b Sevin 80 S 6.25 lb 26 Mar 114a 8a 108a 249a 452a 508a Lorsban 4 EC 4p t 25 Mar 83a 4a 4b li b 40b 126b 306b 487a 88a 16a 27a 64a 263a Untreated check 130a 420a 351a - - Means followed by the same letter in a column were not significantly different (P = 0.05; LSD). Rate Spray Treatment/Formulation form/acre date Pre-spray 27 Mar 28 Mar 29 Mar 1 Apr 2 Apr 4 Apr 8 Apr Sevin XLR 4 L 5q t 26 Mar 35a 7a 6a 9a l a 0b 3b 86b Sevin 80 S 26 Mar 19a 5a 6a 6a 2a 0b 3b 83b 6.25 lb Lorsban 4 EC 4p t 25 Mar 24a 5a 5a 4a 0a l b l b 87b Untreated check 22a 4a 8a 21a 14a 17a 30a 390a — — Means followed by the >ame letter in a column were not significantly different (P = 0.05; LSD). ORANGE: Citrus sinensis (L.) Osbeck 'Marrs' J. Victor French and Santiago Villarreal (12D) California red scale (CRS); Aonidiella aurantii (Maskell) Texas A&M-Kingsville Citrus Center P.O.Bo x 1150 Weslacc ,T X 78599-1150 (210)968-213 2 CALIFORNIA RED SCALE CONTROL ON NURSERY CITRUS, 1996: Experimental V-71639, alone and tank-mixed with NR 435 spray oil, were compared with the insecticides Danitol, Provado and Supracide for efficacy against CRS. Each treatment was replicated on 3—4 container-grown sweet orange trees, each 4- 5 ft tall. Trees were sprayed to foliar runoff, with control trees receiving a water spray, using a TQ-40 Koke Kap C0 sprayer at 30 psi. Treatment sprays were applied on 2 Jul. At weekly post-spray intervals, 3 mature leaves per replicate were randomly selected and lst-3rd stage CRS (minimum of 250 per treatment) were examined under a binocular microscope. Sessile CRS were recorded as dead by the absence of body fluid when probed with a teasing needle. Percent mortality of crawlers and sessile CRS was determined for each treatment. Supracide gave superior initial knockdown of CRS, with mortality increasing in all treatments by 14 DAT . Both V-71639 treatments provided bet ter CRS control than Danitol, but were less effective than the Provado and Supracide; the latter treatments giving greater than 90% mortality through 49 DAT. No phytotoxicity was observed after any spray treatments. % Mortality lst-3rd stage CRS DAT: Rate + 14 + 21 + 28 + 35 Treatment gm/AI/acre + 7 +4 2 +4 9 Postspray mean 93.3a 80.6bc V-71639 0.86 EC 30 41.9bc 55.0d 74. I d 93.7a 89.6ab 75.4cd 30 36.7cd 72.0bc 75.6cd 74.3b 66.0c 84.8b 87.0b 70.9d V-71639 0.86 EC + NR 435 Oil 0.05% 61.3cd 73.4d 71.3b 43.6d 73.2c Danitol 2.4 EC 136 19.7de 37.3c 54.3e 95.la b Provado 1.6 F 12 58.9b 76.6ab 90.7ab 88.4a 98.0a 99.8a 86.8ab 24 49.2bc 66.7bcd 86.5abc 94.2a 97.1a 93.8a Provado 1.6 F 95.9ab 83.4bc Provado 70 DF 24 13.6e 14.0e 83.2bcd 88.0a 98.4a 96.2a 93.0ab 69.5d Supracide 2 E 170 83.9a 87.3a 96.1a 97.3a 97.3a 94.2a 98.5ab 93.5a Untreated check 0.6e 2.4e 5.0e 24.2c 8.7e 8.5d 22.9d 10.3f Treatment means in a column not showing a common letter are significantly different as separated by Waller Duncan K-Ratio Test (P s 0.001). Data transformed by arcsin Y " for analysis.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 1997
Access the full text.
Sign up today, get DeepDyve free for 14 days.