ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Gamma irradiation for after harvest disinfestation of diapausing twospotted spider mite (Acari: Tetranychidae).

Lester, P. J.; Petry, R. J.;

Journal of Economic Entomology Year: 1995 Vol: 88 Issue: 5 Pages: 1361-1364 Ref: 27 ref.

1995

บทคัดย่อ

Adult diapausing Tetranychus urticae were treated with 150-5000 grays (Gy) gamma irradiation. Mites were placed on bean (Phaseolus vulgaris) leaves, and oviposition, egg hatch and mite mortality were recorded every 2 days. Analysis indicated that 351 Gy would give Probit 9 (99.9968% mortality) quarantine security for the production of only sterile eggs. This treatment appears to be of most use as a quarantine method. The dose to inhibit 99% of oviposition (LD99) was estimated to be 2106 Gy; the LD99 required to kill mites within 10 days of treatment was estimated to be 6582 Gy. These doses are likely to produce unacceptable damage to most horticultural produce. Doses between 150 and 600 Gy significantly increased estimated time until 99% mortality after treatment (LT99) of mites, relative to control mortalities. Mites irradiated at 350 Gy after being in diapause for 1-12 weeks produced no viable eggs, but mites that had been in diapause for longer periods produced non-viable eggs at a significan

tly faster rate. Diapausing T. urticae appear more tolerant to irradiation than non-diapausing mites.