Effect of polymer seed coating and seed dressing with pesticides on seed quality and storability of hybrid cucumber.

Keawkham, T., Siri, B., and Hynes, R.K. (2014). "Effect of polymer seed coating and seed dressing with pesticides on seed quality and storability of hybrid cucumber.", Australian Journal of Crop Science, 8(10), pp. 1415-1420.

Abstract

The purpose of this study was to compare hybrid cucumber seed germination and germination index of polymer (hydroxypropyl methycellulose) coated seed to seed dressing with pesticides, metalaxyl and imidacloprid. Cucumber seed was treated with polymer alone, polymer + metalaxyl 1X and 2X product label rate, polymer + imidacloprid 1X and 2X product label rate, polymer + metalaxyl 1X and imidacloprid 1X product label rate. Seed dressing treatments mirrored those above with the exception of the dual pesticide treatment which was omitted. Seed germination tests were conducted under laboratory (25 degreesC) and greenhouse conditions (35 degreesC) immediately, following accelerated seed aging (42 degreesC, about 100% RH) and seed storage under controlled (15 degreesC, 40% RH) and ambient (25degreesC,75% RH) conditions. Seed germination values immediately following treatment were not significantly different (P=0.05) and varied from 85 to 95% in the laboratory and greenhouse. Seed germination values from accelerated ageing tests revealed some significant differences among treatments; however, there was no clear differentiation among polymer seed coating and seed dressing with pesticides. Seed germination of polymer coated seed, seed dressed and untreated seed stored for 8 months under controlled conditions were not significantly different. In contrast, seed germination of polymer coated seed stored under ambient conditions for 8 months decreased 58 and 46%, as compared to 13 and 11% for seed dressed treatments tested in the laboratory and greenhouse, respectively. This study indicated that polymer seed coating of hybrid cucumber was not compatible with seed viability following storage at 25 degreesC, 75% RH.

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