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Pear, Pink and Petal Fall Timing of Manzate, 1993

Pear, Pink and Petal Fall Timing of Manzate, 1993 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/30/4639210 by DeepDyve user on 02 August 2020 30 Arthropod Management Tests, Vol. 19 A: POME FRUITS PEAR: Pyrus communis L. 'Bosc' and 'Cornice' Richard Hilton, Philip VanBuskirk and Peter Westigard (20A) Pear psylla (PP); Cacopsylla pyricola Foerster Oregon State University Southern Oregon Experiment Station 569 Hanley Road Medford, OR 97502 PEAR, PINK AND PETAL FALL TIMING OF MANZATE, 1993: Applications were made to 20 year-old Bosc and Cornice pear trees using a commercial air-carrier sprayer set to deliver 200 gpa. Each treatment was composed of 5, 20-tree replicates. Manzate 200 DF at either 6 or 8 lb formulated/acre was applied at pink bud (5 Apr), petal fall (28 Apr) or at both timings. Morestan 25 WP (5 lb/ac) was applied at the pink stage and used as the standard treatment. Estimates of PP nymphal densities were made by counts on 20 fruit cluster leaves/rep. Adult PP were recorded from 3 beating tray samples per replication. The application of Manzate at both pink and petal fall timings provided statistically better PP nymphal control than that achieved with a single treatment at either timing. There was no significant difference in nymphal control between rates of Manzate used. The single application of Morestan at pink provided the best PP suppression producing an overall 96% reduction in nymphal densities. Differences in nymphal control were reflected in subsequent densities of summer PP adults with Morestan providing an 88% reduction and that of the pink-petal fall Manzate about 70% reduction. As with nymphal control, there was no significant difference in PP adult control between the two rates of Manzate used. Avg no. PP adults/tray Pretreat- ment Over- Post trea itment winter­ Rate ing Summer Avg no. PP nymphs/leaf form/ form form Treatment/form. acre Application timing 27 Apr 4 May 13 May X % red. 29 Mar 14 May % red. Manzate 200 DF 6 lbs Pink 1.3b 5.3de 2.5c 3.0c 47 4.6a 3.7bc 45 Manzate 200 DF 6 lbs Pink & Petal Fall 1.6b 1.2ab 0.6ab 1.1b 81 3.6a 1.9ab 72 6 lbs Petal Fall 3.4c 2.6bc 1.3b 2.4c 58 3.5a 7.0d 0 Manzate 200 DF Manzate 200 DF 8 lbs Pink 1.2b 5.6ef 3.3c 3.4c 41 2.5a 2.7abc 60 Manzate 200 DF 8 lbs Pink & Petal Fall 1.2b 0.9a 0.3a 0.8b 86 4.3a 2.2ab 67 Manzate 200 DF 8 lbs Petal Fall 4.0c 3.4cd 0.8ab 2.7c 53 2.9a 4.7cd 30 Morestan 25 % W 5 lbs Pink 0.2a 0.2a 0.2a 0.2a 96 4.5a 0.8a 88 Check 3.3c 8.0f 5.8d 5.7d 4.1a 6.7d Means within a column followed by the same letter are not significantly different (P = 0.05 Fisher's protected LSD). Data were subjected to V x + 0.5 transformation for statistical analysis. Nontransformed means are presented for comparison. PEAR: Pyrus communis L., 'Bartlett' Larry A. Hull (21A) Pear psylla (PP); Cacopsylla pyricola Foerster Penn State University Fruit Research Lab Biglerville, PA 17307 PEAR, SEASONAL PEAR PSYLLA CONTROL, 1993: Experimental sprays were applied to replicated 6-12 tree plots in a block of 'Bartlett' (84%), 'Bosc' (9%), and 'D'Anjou' (7%) pears. Trees were spaced 24 X 24 ft apart and were 14 years old. Each treatment was replicated 4 times in a randomized block design. All treatments were applied dilute to run off with a handgun from a truck mounted hydraulic sprayer at 400 psi. An average of 3 gal was applied per tree (approx. 225 gpa). Insecticide application dates varied among treatments and are listed in the tables. All plots received a regular fungicide maintenance schedule of Benlate 50DF, Streptomycin and Ziram 76WP. All sampling was conducted on the middle 'Bartlett' tree in each replicate. All treatments were evaluated by counting eggs and/or nymphs from leaf samples using a binocular microscope under 10X magnification at 6 to 13 day intervals. Counts were made on 15 spur leaf samples from 10 May to 1 Jun, on 7 spur and 8 third most distal leaf samples from 7 to 14 Jun, on 15 third most distal leaf samples on 21 Jun, and on 10 third most distal leaf samples from 1 to 14 Jul. Excellent prebloom control was provided by all treatments with SunSpray 6E Oil plus Asana XL at budburst followed by Morestan at white bud giving the lowest number of PP nymphs per leaf. Of the 3 timings for Agri-Mek, the 25 May (1st cover) application appeared to provide the best control. However, it is important to note that SunSpray Ultra Fine Oil was mistakenly dropped from the petal fall application. Mitac (CR-20855) and CR-19860 applied at petal fall showed good activity on PP, but failed to control this pest when applied at 2nd cover. The combination of Imidan 70WP plus SunSpray Ultra Fine Oil did not have much activity against PP. Two applications of Insegar at budburst and white bud provided excellent control of PP through 2nd cover. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Pear, Pink and Petal Fall Timing of Manzate, 1993

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Publisher
Oxford University Press
Copyright
© 1994, Entomological Society of America
eISSN
2155-9856
DOI
10.1093/amt/19.1.30
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/19/1/30/4639210 by DeepDyve user on 02 August 2020 30 Arthropod Management Tests, Vol. 19 A: POME FRUITS PEAR: Pyrus communis L. 'Bosc' and 'Cornice' Richard Hilton, Philip VanBuskirk and Peter Westigard (20A) Pear psylla (PP); Cacopsylla pyricola Foerster Oregon State University Southern Oregon Experiment Station 569 Hanley Road Medford, OR 97502 PEAR, PINK AND PETAL FALL TIMING OF MANZATE, 1993: Applications were made to 20 year-old Bosc and Cornice pear trees using a commercial air-carrier sprayer set to deliver 200 gpa. Each treatment was composed of 5, 20-tree replicates. Manzate 200 DF at either 6 or 8 lb formulated/acre was applied at pink bud (5 Apr), petal fall (28 Apr) or at both timings. Morestan 25 WP (5 lb/ac) was applied at the pink stage and used as the standard treatment. Estimates of PP nymphal densities were made by counts on 20 fruit cluster leaves/rep. Adult PP were recorded from 3 beating tray samples per replication. The application of Manzate at both pink and petal fall timings provided statistically better PP nymphal control than that achieved with a single treatment at either timing. There was no significant difference in nymphal control between rates of Manzate used. The single application of Morestan at pink provided the best PP suppression producing an overall 96% reduction in nymphal densities. Differences in nymphal control were reflected in subsequent densities of summer PP adults with Morestan providing an 88% reduction and that of the pink-petal fall Manzate about 70% reduction. As with nymphal control, there was no significant difference in PP adult control between the two rates of Manzate used. Avg no. PP adults/tray Pretreat- ment Over- Post trea itment winter­ Rate ing Summer Avg no. PP nymphs/leaf form/ form form Treatment/form. acre Application timing 27 Apr 4 May 13 May X % red. 29 Mar 14 May % red. Manzate 200 DF 6 lbs Pink 1.3b 5.3de 2.5c 3.0c 47 4.6a 3.7bc 45 Manzate 200 DF 6 lbs Pink & Petal Fall 1.6b 1.2ab 0.6ab 1.1b 81 3.6a 1.9ab 72 6 lbs Petal Fall 3.4c 2.6bc 1.3b 2.4c 58 3.5a 7.0d 0 Manzate 200 DF Manzate 200 DF 8 lbs Pink 1.2b 5.6ef 3.3c 3.4c 41 2.5a 2.7abc 60 Manzate 200 DF 8 lbs Pink & Petal Fall 1.2b 0.9a 0.3a 0.8b 86 4.3a 2.2ab 67 Manzate 200 DF 8 lbs Petal Fall 4.0c 3.4cd 0.8ab 2.7c 53 2.9a 4.7cd 30 Morestan 25 % W 5 lbs Pink 0.2a 0.2a 0.2a 0.2a 96 4.5a 0.8a 88 Check 3.3c 8.0f 5.8d 5.7d 4.1a 6.7d Means within a column followed by the same letter are not significantly different (P = 0.05 Fisher's protected LSD). Data were subjected to V x + 0.5 transformation for statistical analysis. Nontransformed means are presented for comparison. PEAR: Pyrus communis L., 'Bartlett' Larry A. Hull (21A) Pear psylla (PP); Cacopsylla pyricola Foerster Penn State University Fruit Research Lab Biglerville, PA 17307 PEAR, SEASONAL PEAR PSYLLA CONTROL, 1993: Experimental sprays were applied to replicated 6-12 tree plots in a block of 'Bartlett' (84%), 'Bosc' (9%), and 'D'Anjou' (7%) pears. Trees were spaced 24 X 24 ft apart and were 14 years old. Each treatment was replicated 4 times in a randomized block design. All treatments were applied dilute to run off with a handgun from a truck mounted hydraulic sprayer at 400 psi. An average of 3 gal was applied per tree (approx. 225 gpa). Insecticide application dates varied among treatments and are listed in the tables. All plots received a regular fungicide maintenance schedule of Benlate 50DF, Streptomycin and Ziram 76WP. All sampling was conducted on the middle 'Bartlett' tree in each replicate. All treatments were evaluated by counting eggs and/or nymphs from leaf samples using a binocular microscope under 10X magnification at 6 to 13 day intervals. Counts were made on 15 spur leaf samples from 10 May to 1 Jun, on 7 spur and 8 third most distal leaf samples from 7 to 14 Jun, on 15 third most distal leaf samples on 21 Jun, and on 10 third most distal leaf samples from 1 to 14 Jul. Excellent prebloom control was provided by all treatments with SunSpray 6E Oil plus Asana XL at budburst followed by Morestan at white bud giving the lowest number of PP nymphs per leaf. Of the 3 timings for Agri-Mek, the 25 May (1st cover) application appeared to provide the best control. However, it is important to note that SunSpray Ultra Fine Oil was mistakenly dropped from the petal fall application. Mitac (CR-20855) and CR-19860 applied at petal fall showed good activity on PP, but failed to control this pest when applied at 2nd cover. The combination of Imidan 70WP plus SunSpray Ultra Fine Oil did not have much activity against PP. Two applications of Insegar at budburst and white bud provided excellent control of PP through 2nd cover.

Journal

Arthropod Management Tests – Oxford University Press

Published: Jan 1, 1994

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