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OVERWINTERING POTENTIAL OF THE INVASIVE LEAFMINER TUTA ABSOLUTA IN BELGIUM
V. VAN DAMME1,2, H. CASTEELS2, N. BERKVENS2, L. TIRRY1, R. DE VIS3, P.
1Ghent University, Faculty of Bioscience Engineering, Department of Crop Protection, Laboratory of
Agrozoology, Coupure Links 693, 9000 Gent, Belgium
2Institute for Agricultural and Fisheries Research (ILVO),Plant Sciences Unit, Crop Protection, Burg.
Van Gansberghelaan 96, 9820 Merelbeke, Belgium
3 Research Station for Vegetable Production npo, Duffelsesteenweg 101, 2860 Sint-Katelijne-Waver,
The tomato leafminer Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is a devastating pest in tomato crops with a natural distribution in South America. After its initial detection in 2006 in Spain, it has spread rapidly in the Mediterranean area and has recently become established in greenhouses
in Western Europe, including Belgium.
It was assumed that the low temperatures commonly associated with the Belgian winters would prevent this exotic species from successful overwintering. However, the observed presence of T. absoluta at the start of the growing season sparked a study on its potential to overwinter in our climate. The insect’s cold hardiness was determined by: (1) the supercooling point (SCP) of larvae, pupae and adults, and (2) the median lowerlethal time (LT50) for the above mentioned stages at 0° and 5°C, in order to reflectwinter conditions in Western Europe.
The lowest SCP was recorded for the larvae (-18,2+ 2,0 °C). The SCP for adults and pupae was respectively -17,2+ 2,2°C and -16,7+ 1,1 °C. Based on estimates of the lower lethal time adults demonstrated more cold hardiness than larvae and pupae for both 0°C and 5°C. For larvae and pupae there was no difference in survival between 0°C and 5°C. Adults showed higher survival when exposed to 5°C than to 0°C, with half of the adult population still alive after nearly four weeks at the former temperature.
The above findings suggest that the cold hardiness of T. absoluta may enable the species to overwinter in and around greenhouses in our region. As at most tomato production sites the period between two successive tomato crops lasts less than two weeks and temperature inside the glasshouse is kept above zero, T. absoluta may survive as adult, larvae and pupae between two crop cycles.
Key words: Tuta absoluta, tomato, cold tolerance, supercooling point, lethal time
|Titel||65th International Symposium on Crop Protection|
|Status||Gepubliceerd - 21-mei-2013|
|Evenement||65th International Symposium on Crop Protection (2013) - Gent, België|
Duur: 21-mei-2013 → 21-mei-2013