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CONTROL OF LEAFMINER USING ARENA WSG, 2004

CONTROL OF LEAFMINER USING ARENA WSG, 2004 (G28) CHRYSANTHEMUM: Dendranthema grandiflora Tzvelev, ‘Miramar’ Steve Thompson Texas A&M University Biological Control Laboratory Entomology Department Mail Stop 2475 College Station, TX 77843-2475 Phone: (979) 862-3407 E-mail: spthompson@tamu.edu Peter C. Krauter E-mail: p-krauter@tamu.edu Kevin M. Heinz E-mail: KHeinz@ag.tamu.edu A leafminer: Liriomyza langei Frick The goal of this work was to assess the efficacy of the insecticide Arena 16WSG for control of Liriomyza langei infesting Chrysanthemum. This experiment was conducted within a growth room on the campus of Texas A&M University. The CR design involved six treatments with four replicates each consisting of four chrysanthemums planted individually into 4-inch diameter plastic pots (volume: 708 ml). Therefore, the entire experiment included 96 plants (one plant per pot). Rooted chrysanthemum cuttings (var. ‘Miramar’) were grown under greenhouse conditions, and irrigation and fertilization (375 ppm N liquid feed) were applied as necessary. After growing for one wk, plants received soil drench treatments of 50 ml insecticide solution per pot. Pots were then held for eleven additional days prior to expose to adult leafminers. Leafminer exposure consisted of placing 20 plants into a cage containing 100 adult Liriomyza for 3 h. The plants were then held in a growth room for 8 d (temperature = 22-29°C) to permit development of the leafminer larvae. After 8 d the total no. of mines in each plant was visually counted, however, some error in this count existed due to the presence of multiple mines within a leaf. Each plant ht was measured and total leaves counted to detect any phytotoxic or growth inhibition effect. Each plant was then cut at the soil line and put into a brown paper bag to permit collection of leafminer pupae. The bags were sealed and after 4 d all pupae in each bag was counted. Treatment means were analyzed using one way ANOVA and means were separated using an F-protected Tukey’s (P ≤ 0.05). There were statistical differences in the no. of pupae obtained (F = 40.32, P < 0.001). There were significantly more pupae found within the bags holding the control plants. However, there were no significant differences among any of the Arena treatments or between the Flagship treatment and any of the Arena treatments. Analysis of plant ht and no. of leaves per plant revealed no phytotoxic or growth effect of any of the tested products (leaves F = 0.48, P = 0.790; ht F = 2.45, P = 0.493). Treatment/ Rate Mean Mean formulation amt/100 gal no. of pupae no. of mines Arena 16WSG 2.0 oz 0.06a 0.06a Arena 16WSG 3.0 oz 0.00a 0.00a Arena 16WSG 4.0 oz 0.00a 0.00a Flagship 25WG 4.0 oz 0.00a 0.00a Marathon II SC 1.7 fl oz 7.25b 5.06b Untreated check --- 10.31c 7.44c Means in a column followed by the same letter are not significantly different (P > 0.05, Tukey’s). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF LEAFMINER USING ARENA WSG, 2004

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Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/30.1.G28
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Abstract

(G28) CHRYSANTHEMUM: Dendranthema grandiflora Tzvelev, ‘Miramar’ Steve Thompson Texas A&M University Biological Control Laboratory Entomology Department Mail Stop 2475 College Station, TX 77843-2475 Phone: (979) 862-3407 E-mail: spthompson@tamu.edu Peter C. Krauter E-mail: p-krauter@tamu.edu Kevin M. Heinz E-mail: KHeinz@ag.tamu.edu A leafminer: Liriomyza langei Frick The goal of this work was to assess the efficacy of the insecticide Arena 16WSG for control of Liriomyza langei infesting Chrysanthemum. This experiment was conducted within a growth room on the campus of Texas A&M University. The CR design involved six treatments with four replicates each consisting of four chrysanthemums planted individually into 4-inch diameter plastic pots (volume: 708 ml). Therefore, the entire experiment included 96 plants (one plant per pot). Rooted chrysanthemum cuttings (var. ‘Miramar’) were grown under greenhouse conditions, and irrigation and fertilization (375 ppm N liquid feed) were applied as necessary. After growing for one wk, plants received soil drench treatments of 50 ml insecticide solution per pot. Pots were then held for eleven additional days prior to expose to adult leafminers. Leafminer exposure consisted of placing 20 plants into a cage containing 100 adult Liriomyza for 3 h. The plants were then held in a growth room for 8 d (temperature = 22-29°C) to permit development of the leafminer larvae. After 8 d the total no. of mines in each plant was visually counted, however, some error in this count existed due to the presence of multiple mines within a leaf. Each plant ht was measured and total leaves counted to detect any phytotoxic or growth inhibition effect. Each plant was then cut at the soil line and put into a brown paper bag to permit collection of leafminer pupae. The bags were sealed and after 4 d all pupae in each bag was counted. Treatment means were analyzed using one way ANOVA and means were separated using an F-protected Tukey’s (P ≤ 0.05). There were statistical differences in the no. of pupae obtained (F = 40.32, P < 0.001). There were significantly more pupae found within the bags holding the control plants. However, there were no significant differences among any of the Arena treatments or between the Flagship treatment and any of the Arena treatments. Analysis of plant ht and no. of leaves per plant revealed no phytotoxic or growth effect of any of the tested products (leaves F = 0.48, P = 0.790; ht F = 2.45, P = 0.493). Treatment/ Rate Mean Mean formulation amt/100 gal no. of pupae no. of mines Arena 16WSG 2.0 oz 0.06a 0.06a Arena 16WSG 3.0 oz 0.00a 0.00a Arena 16WSG 4.0 oz 0.00a 0.00a Flagship 25WG 4.0 oz 0.00a 0.00a Marathon II SC 1.7 fl oz 7.25b 5.06b Untreated check --- 10.31c 7.44c Means in a column followed by the same letter are not significantly different (P > 0.05, Tukey’s).

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2005

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