ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Postharvest disinfestation of diapausing and non-diapausing twospotted spider mite (Tetranychus urticae) on persimmons: hot water immersion and coolstorage.

Lester, P. J.; Dentener, P. R.; Bennett, K. V.; Connolly, P. G.;

Entomologia Experimentalis et Applicata Year: 1997 Vol: 83 Issue: 2 Pages: 189-193 Ref: 23 ref.

1997

บทคัดย่อ

The mortality response of diapausing and non-diapausing Tetranychus urticae on persimmons to hot water immersion treatments between 44 and 54 deg C was examined, for potential as a quarantine treatment. The mean immersion time for mean 99% mortality (LT99) of diapausing mites at 44 deg C was 211 min, and this time decreased with increasing temperature to 3.6 min at 54 deg C. Non-diapausing mites were found to be less tolerant to temperatures below 48 deg C, with an estimated LT99 of 102 min at 44 deg C, but had similar thermotolerance above 48 deg C. In 47 deg C water, the immersion time required to kill 99% of diapausing mites was estimated as 67 min. This time was not reduced by subsequent cool storage at 0 deg C for up to 8 weeks. Rather, cool storage had the effect of keeping mites alive, relative to LT99 estimates calculated for mites stored at 20 deg C. Similarly, the thermotolerance of mites did not change with increased time in diapause, although mites in diapause for 12 weeks had high c

ontrol mortality.