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Apple, Effect of IGRS on Stethorus Punctum Egg Viability, 1990

Apple, Effect of IGRS on Stethorus Punctum Egg Viability, 1990 14 INSECTICIDE & ACARICIDE TESTS, VOL. 16 A: POME FRUITS APPLE: Malus domestica Borkh. L. A. Hull and D. J. Biddinger (14A) Stethorus punctum (SP) (LeConte) Penn State University Fruit Research Laboratory Biglerville, PA 17309-0309 APPLE, EFFECT OF IGRs ON STETHORUS PUNCTUM EGG VIABILITY, 1990: Leaves with eggs of SP were randomly collected from an apple orchard heavily populated with this predator. Leaves with eggs were brought into the laboratory and held at 20°C for 24 h. The leaves were dipped for 2 sec in solutions of various materials and allowed to air dry, then transferred to petri dishes containing moist pieces of paper towels to maintain high relative humidity. The dishes were placed in a growth chamber set at 20°C, 16:8 (L/D). Each treatment was replicated five times with 6-8 eggs/replicate. Eggs were exmained every 2- 3 d to determine hatch and larval survival. There was no difference in percentage of eggs dead for RH-5992, Guthion, and the control, whereas, Insegar was toxic to eggs of SP. Guthion appeared to be toxic to neonate larvae as they hatched. %Egg No. eggs Live Ppm tested Hatched Dead Treatment larvae RH-5992 2 F 90 44 52.5a 47.5a 48.6ab Insegar 25 WP 40 33 19.9b 80.1b 14.2c Guthion 35 WP 300 41 46.3ab 53.7ab 22.1bc Control-distilled (water) — 39 65.3a 34.7a 65.3a Means in columns followed by the same letter are not significantly different (P = 0.05; DMRT). APPLE: Malus domestica Borkh. 'Yorking' L. A. Hull and D. J. Biddinger (15A) European red mite (ERM); Panonychus ulmi (Koch) Penn State University Fruit Research Laboratory Stethorus punctum (LeConte) Twospotted spider mite (TSSM); Tetranychus urticae Koch Biglerville, PA 17307-0309 APPLE, EVALUATION OF RH-5992 ON STETHORUS PUNCTUM, 1990: Experimental sprays were applied to single-tree plots (cv Yorking) arranged in a randomized complete block design. Each treatment was replicated 4 times. The trees were planted to a spacing of 20 x 20 ft. Treatments were applied with a platform-mounted John Bean sprayer, 35 gpm pump, equipped with a handgun to thoroughly wet the trees. Approximately 4.2 gal of spray were applied per replicate tree. Date of application was 8 Aug. During the experiment, general maintenance sprays of captan and calcium chloride, as well as 2 alternate-row applications of Guthion 35 WP and Lannate 1.8 L (0.35 and 0.225 lb (AI)/acre, respectively) were applied to all plots on 9 and 23 Aug. The effect of treatments on mites was evaluated by counting mites several times during the season on samples of 25 leaves/tree, 100 leaves/treatment. The effect of sprays on the mite predator S. punctum was evaluated by 3-min counts of adults, larvae, and pupae around the periphery of test trees. None of the treatments affected any stages of S. punctum within the first two wk after application. Variation in treatments starting on 21 Aug appear to be due to declining mite populations. Mites/leaf S. punctum/3 min ERM TSSM Ad Lar Pup Ad Lar Pup Rate/100 gal Treatment (lbs AI) 7 Aug 7 Aug 7 Aug 7 Aug 7 Aug 13 Aug 13 Aug 13 Aug RH-5992 2 F 158 ml (0.0833) 6.6a 7.8a 5.0a 23.0a 10.5a 4.0a 0.5b 5.3a RH-5992 2 F 316 ml (0.1666) 12.0a 15.9a 6.8a 32.5a 15.8a 4.8a 2.0a 6.5a Lorsban 50 WP 454 g (0.5) 9.5a 12.6a 7.5a 29.3a 4.3a 12.8a 7.0a 4.8a Control - water 11.0a 15.1a 4.3a 24.0a 2.0a 21.0a 8.8a 40 a Means in columns followed by the same letter(s) are not significantly different (P = 0.05; DMRT). Spray date; 8 Aug. ] Mites/leaf min S. punctum/3 ERM TSSM Ad Lar Pup Ad Pup Lar Rate/100 gal Treatment (lbs AI) 13 Aug 13 Aug 15 Aug 15 Aug 15 Aug 17 Aug 17 Aug 17 Aug RH-5992 2 F 158 ml (0.0833) 4.9a 14.1a 23.5a 13.8a 4.3a 30.0a 7.0a 5.5a RH-5992 2 F 316 ml (0.1666) 10.9a 26.2b 27.3a 22.8a 7.8a 46.0a 18.3a 7.3a Lorsban 50 WP 454 g (0.5) 8.5a 9.7a 32.3a 15.0a 5.5a 45.5a 14.3a 6.3a 7.8a 18.5ab 34.8a 18.0a 4.5a 34.5a 15.0a 3.8a Control - water are not s: ignificantly different (P = 0.05; DMRT). Means in columns followed by the same letter(s) Spray date: 8 Aug. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Apple, Effect of IGRS on Stethorus Punctum Egg Viability, 1990

Arthropod Management Tests , Volume 16 (1): 1 – Jan 1, 1991

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Publisher
Oxford University Press
Copyright
© 1991 Entomological Society of America
eISSN
2155-9856
DOI
10.1093/iat/16.1.14
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Abstract

14 INSECTICIDE & ACARICIDE TESTS, VOL. 16 A: POME FRUITS APPLE: Malus domestica Borkh. L. A. Hull and D. J. Biddinger (14A) Stethorus punctum (SP) (LeConte) Penn State University Fruit Research Laboratory Biglerville, PA 17309-0309 APPLE, EFFECT OF IGRs ON STETHORUS PUNCTUM EGG VIABILITY, 1990: Leaves with eggs of SP were randomly collected from an apple orchard heavily populated with this predator. Leaves with eggs were brought into the laboratory and held at 20°C for 24 h. The leaves were dipped for 2 sec in solutions of various materials and allowed to air dry, then transferred to petri dishes containing moist pieces of paper towels to maintain high relative humidity. The dishes were placed in a growth chamber set at 20°C, 16:8 (L/D). Each treatment was replicated five times with 6-8 eggs/replicate. Eggs were exmained every 2- 3 d to determine hatch and larval survival. There was no difference in percentage of eggs dead for RH-5992, Guthion, and the control, whereas, Insegar was toxic to eggs of SP. Guthion appeared to be toxic to neonate larvae as they hatched. %Egg No. eggs Live Ppm tested Hatched Dead Treatment larvae RH-5992 2 F 90 44 52.5a 47.5a 48.6ab Insegar 25 WP 40 33 19.9b 80.1b 14.2c Guthion 35 WP 300 41 46.3ab 53.7ab 22.1bc Control-distilled (water) — 39 65.3a 34.7a 65.3a Means in columns followed by the same letter are not significantly different (P = 0.05; DMRT). APPLE: Malus domestica Borkh. 'Yorking' L. A. Hull and D. J. Biddinger (15A) European red mite (ERM); Panonychus ulmi (Koch) Penn State University Fruit Research Laboratory Stethorus punctum (LeConte) Twospotted spider mite (TSSM); Tetranychus urticae Koch Biglerville, PA 17307-0309 APPLE, EVALUATION OF RH-5992 ON STETHORUS PUNCTUM, 1990: Experimental sprays were applied to single-tree plots (cv Yorking) arranged in a randomized complete block design. Each treatment was replicated 4 times. The trees were planted to a spacing of 20 x 20 ft. Treatments were applied with a platform-mounted John Bean sprayer, 35 gpm pump, equipped with a handgun to thoroughly wet the trees. Approximately 4.2 gal of spray were applied per replicate tree. Date of application was 8 Aug. During the experiment, general maintenance sprays of captan and calcium chloride, as well as 2 alternate-row applications of Guthion 35 WP and Lannate 1.8 L (0.35 and 0.225 lb (AI)/acre, respectively) were applied to all plots on 9 and 23 Aug. The effect of treatments on mites was evaluated by counting mites several times during the season on samples of 25 leaves/tree, 100 leaves/treatment. The effect of sprays on the mite predator S. punctum was evaluated by 3-min counts of adults, larvae, and pupae around the periphery of test trees. None of the treatments affected any stages of S. punctum within the first two wk after application. Variation in treatments starting on 21 Aug appear to be due to declining mite populations. Mites/leaf S. punctum/3 min ERM TSSM Ad Lar Pup Ad Lar Pup Rate/100 gal Treatment (lbs AI) 7 Aug 7 Aug 7 Aug 7 Aug 7 Aug 13 Aug 13 Aug 13 Aug RH-5992 2 F 158 ml (0.0833) 6.6a 7.8a 5.0a 23.0a 10.5a 4.0a 0.5b 5.3a RH-5992 2 F 316 ml (0.1666) 12.0a 15.9a 6.8a 32.5a 15.8a 4.8a 2.0a 6.5a Lorsban 50 WP 454 g (0.5) 9.5a 12.6a 7.5a 29.3a 4.3a 12.8a 7.0a 4.8a Control - water 11.0a 15.1a 4.3a 24.0a 2.0a 21.0a 8.8a 40 a Means in columns followed by the same letter(s) are not significantly different (P = 0.05; DMRT). Spray date; 8 Aug. ] Mites/leaf min S. punctum/3 ERM TSSM Ad Lar Pup Ad Pup Lar Rate/100 gal Treatment (lbs AI) 13 Aug 13 Aug 15 Aug 15 Aug 15 Aug 17 Aug 17 Aug 17 Aug RH-5992 2 F 158 ml (0.0833) 4.9a 14.1a 23.5a 13.8a 4.3a 30.0a 7.0a 5.5a RH-5992 2 F 316 ml (0.1666) 10.9a 26.2b 27.3a 22.8a 7.8a 46.0a 18.3a 7.3a Lorsban 50 WP 454 g (0.5) 8.5a 9.7a 32.3a 15.0a 5.5a 45.5a 14.3a 6.3a 7.8a 18.5ab 34.8a 18.0a 4.5a 34.5a 15.0a 3.8a Control - water are not s: ignificantly different (P = 0.05; DMRT). Means in columns followed by the same letter(s) Spray date: 8 Aug.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1991

Keywords: Argyrotaenia velutinana; Guthion

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