New Zealand Plant Protection 63 (2010): 187-194
The ability of New Zealand flower thrips (NZFT) to tolerate cold temperatures was investigated. Thrips were collected from a range of natural sources in Central Otago over 2 years. Some adult NZFT (predominantly females) survived for up to 2 months on peach fruit at 0-1°C; LT 50 = 35.4 days and LT 99 = 70.7 days. Plant material containing NZFT was exposed for 24 h to -10, -7.5, -5, -2.5 and 0°C and NZFT mortality measured. Irrespective of the time of year when NZFT were collected, mortality was similar after 24 h at -2.5°C to that at 0°C (means = 4.6, 4.7%), but increased with decreasing temperature (mean mortality = 22.5% at -5°C, 66.3% at -7.5°C and 82.0% at -10°C). From -7.5°C downwards, responses to changes in temperature varied between seasons (P<0.01), with autumn adults being less cold-tolerant than those collected in spring. Central Otago winter temperatures would not have threatened the survival of NZFT over the study period.
Keywords: New Zealand flower thrips, Thrips obscuratus, cold tolerance, stonefruit, gorse, seasonal effects.
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Copyright © 2010 New Zealand Plant Protection Society (Inc.).