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Evaluation of Nexter (Bas 3000 111) for Citrus Rust Mite Control, 1996

Evaluation of Nexter (Bas 3000 111) for Citrus Rust Mite Control, 1996 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/66/4639839 by DeepDyve user on 21 July 2020 66 Arthropod Management Tests, Vol. 21 D: CITRUS, NUTS, AND AVOCADOS ORANGE: Citrus sinensis (L.) Osbeck 'Parson Brown' C. C. Childers, T. Gainey, and D. K. Threlkeld (10D) Citrus rust mite (CRM); Phyllocoptruta oleivora (Ashmead) University of Florida, IFAS Citrus Research and Education Center 700 Experiment Station Road Lake Alfred, Florida 33850 Telephone (941) 956-1151 EVALUATION OF NEXTER (BAS 3000 111) FO R CITRUS RUS T MITE CONTROL, 1996: Nexter at two rates per acre were compared for efficacy against CRM with the same rates in combination with one or three concentrations of a NR FC435-66 petroleum oil, Nexter at the low rate tank- mixed with both petroleum oil and copper hydroxide, three concentrations of petroleum oil applied alone, Agri-Mek tank-mixed with petroleum oil and copper hydroxide. Treatments were assigned to 3 X 3 ( = 9 tree) or 3 X 4 ( = 12 tree) plots in a RCB design, replicated 5 times on 10 ft tall trees with 11 X 25 ft spacing. Treatments were applied on 29 and 30 Jul using an FMC 352 PT O airblast sprayer with speed, nozzling and pressure (160 psi) adjusted to apply 250 gpa. At each evaluation date, 20 fruit were randomly selected and examined on the center tree within each replicate using a 10X handlens. All live CRM (except eggs) were counted in two, 1-cm lens fields on partially shaded sides of each fruit. The two counts per fruit were combined and recorded as one observation. The fruit were also rated for damage in terms of % fruit surface russeted and % fruit rejected. Data on CRM counts and cu­ mulative damage ratings were statistically analysed after log, (X + 1) transformation. Untransformed means are presented in the tables for comparison. Both rates of Nexter applied alone provided comparable control of CRM through 76 DAT. By 37 DAT, the Nexter + petroleum oil combinations had significantly greater CRM densities on the fruit compared with Nexter applied alone or Agri-Mek tank-mixed with petroleum oil and copper hydrox­ ide. The Nexter at 0.315 lb AI rate tank-mixed with both petroleum oil and copper hydroxide provided comparable control of CRM to Nexter at 0.315 lb AI applied alone and superior control of CRM compared with Nexter and petroleum oil in combination at the same rates in this experiment. Petroleum oil tank-mixed with Nexter clearly interferes with residual activity of the miticide. Damage rating comparisons between treatments support this conclusion. Mean no. CRM/2 cm of fruit surface DA T 76 84 Treatment/Formulation ^ate form/acre Pre-spray 14 37 51 57 59 O.le O.le 0.9g 2.1d 4.0d 4.5de 6.9ab Nexter 75 WP 0.3151b AI 15.1a Nexter 75 WP 0.5 lb AI 14.0a Oe 0.3e 0.9fg 1.3d 3.3d 6.2de 1.7c Nexter 75 WP + Petroleum oil FC435-66 lga l 15.1a 0.2de 2.2cd 3. Id e 6.1c 6.8c 17.2bc 7.9a Nexter 75 WP 0.315 1b AI + Petroleum oil FC435-66 5 gal 15.4a 0.2de 5.6cd 4.6de 19.6bc 19.4bc 6.4cde 5.3b 0.315 lb AI Nexter 75 WP + Petroleum oil FC435-66 10 gal 16.6a O.lde 3. le d 8.9c 19.6bc 20.5b 29.3a 8.3a 0.315 lb AI Nexter 75 WP + Petroleum oil FC435-66 5 gal 15.7a O.lde 2.5cd 3.3cde 11.8bc 6.0c 8.6bcd 2.9b + Copper hydroxide 50 WP 4 lb metallic 15.6a Oe 2.8cd 2.7ef 1.9d 4.5d 6.5e 1.6c Petroleum oil FC435-66 lga l 14.1a 9.0b 31.3b 20.3b — — — — Petroleum oil FC435-66 5 gal 14.3a 1.2c 5.7c 10.7cd 19.7a — — — Petroleum oil FC435-66 10 gal 14.0a 0.6cd 4.1d 7.9cde 24.5b — — — Agri-mek0.15E C 10 oz + Petroleum oil FC435-66 5 gal + Copper hydroxide 50 WP 4 lb metallic 13.6a O.lde Oe 0.3g O.le O.le 0.2f 0.2d Untreated Check 13.3a 26.1a 42.8a 36.0a 34.3a 30.2a 15.7b 4.1b Mean in a column followed by the same letter are not significantly different (P = 0.05; WD). Downloaded from https://academic.oup.com/amt/article-abstract/22/1/66/4639839 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Evaluation of Nexter (Bas 3000 111) for Citrus Rust Mite Control, 1996

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Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.66
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/66/4639839 by DeepDyve user on 21 July 2020 66 Arthropod Management Tests, Vol. 21 D: CITRUS, NUTS, AND AVOCADOS ORANGE: Citrus sinensis (L.) Osbeck 'Parson Brown' C. C. Childers, T. Gainey, and D. K. Threlkeld (10D) Citrus rust mite (CRM); Phyllocoptruta oleivora (Ashmead) University of Florida, IFAS Citrus Research and Education Center 700 Experiment Station Road Lake Alfred, Florida 33850 Telephone (941) 956-1151 EVALUATION OF NEXTER (BAS 3000 111) FO R CITRUS RUS T MITE CONTROL, 1996: Nexter at two rates per acre were compared for efficacy against CRM with the same rates in combination with one or three concentrations of a NR FC435-66 petroleum oil, Nexter at the low rate tank- mixed with both petroleum oil and copper hydroxide, three concentrations of petroleum oil applied alone, Agri-Mek tank-mixed with petroleum oil and copper hydroxide. Treatments were assigned to 3 X 3 ( = 9 tree) or 3 X 4 ( = 12 tree) plots in a RCB design, replicated 5 times on 10 ft tall trees with 11 X 25 ft spacing. Treatments were applied on 29 and 30 Jul using an FMC 352 PT O airblast sprayer with speed, nozzling and pressure (160 psi) adjusted to apply 250 gpa. At each evaluation date, 20 fruit were randomly selected and examined on the center tree within each replicate using a 10X handlens. All live CRM (except eggs) were counted in two, 1-cm lens fields on partially shaded sides of each fruit. The two counts per fruit were combined and recorded as one observation. The fruit were also rated for damage in terms of % fruit surface russeted and % fruit rejected. Data on CRM counts and cu­ mulative damage ratings were statistically analysed after log, (X + 1) transformation. Untransformed means are presented in the tables for comparison. Both rates of Nexter applied alone provided comparable control of CRM through 76 DAT. By 37 DAT, the Nexter + petroleum oil combinations had significantly greater CRM densities on the fruit compared with Nexter applied alone or Agri-Mek tank-mixed with petroleum oil and copper hydrox­ ide. The Nexter at 0.315 lb AI rate tank-mixed with both petroleum oil and copper hydroxide provided comparable control of CRM to Nexter at 0.315 lb AI applied alone and superior control of CRM compared with Nexter and petroleum oil in combination at the same rates in this experiment. Petroleum oil tank-mixed with Nexter clearly interferes with residual activity of the miticide. Damage rating comparisons between treatments support this conclusion. Mean no. CRM/2 cm of fruit surface DA T 76 84 Treatment/Formulation ^ate form/acre Pre-spray 14 37 51 57 59 O.le O.le 0.9g 2.1d 4.0d 4.5de 6.9ab Nexter 75 WP 0.3151b AI 15.1a Nexter 75 WP 0.5 lb AI 14.0a Oe 0.3e 0.9fg 1.3d 3.3d 6.2de 1.7c Nexter 75 WP + Petroleum oil FC435-66 lga l 15.1a 0.2de 2.2cd 3. Id e 6.1c 6.8c 17.2bc 7.9a Nexter 75 WP 0.315 1b AI + Petroleum oil FC435-66 5 gal 15.4a 0.2de 5.6cd 4.6de 19.6bc 19.4bc 6.4cde 5.3b 0.315 lb AI Nexter 75 WP + Petroleum oil FC435-66 10 gal 16.6a O.lde 3. le d 8.9c 19.6bc 20.5b 29.3a 8.3a 0.315 lb AI Nexter 75 WP + Petroleum oil FC435-66 5 gal 15.7a O.lde 2.5cd 3.3cde 11.8bc 6.0c 8.6bcd 2.9b + Copper hydroxide 50 WP 4 lb metallic 15.6a Oe 2.8cd 2.7ef 1.9d 4.5d 6.5e 1.6c Petroleum oil FC435-66 lga l 14.1a 9.0b 31.3b 20.3b — — — — Petroleum oil FC435-66 5 gal 14.3a 1.2c 5.7c 10.7cd 19.7a — — — Petroleum oil FC435-66 10 gal 14.0a 0.6cd 4.1d 7.9cde 24.5b — — — Agri-mek0.15E C 10 oz + Petroleum oil FC435-66 5 gal + Copper hydroxide 50 WP 4 lb metallic 13.6a O.lde Oe 0.3g O.le O.le 0.2f 0.2d Untreated Check 13.3a 26.1a 42.8a 36.0a 34.3a 30.2a 15.7b 4.1b Mean in a column followed by the same letter are not significantly different (P = 0.05; WD). Downloaded from https://academic.oup.com/amt/article-abstract/22/1/66/4639839 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.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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