Exigencias termicas de Bemisia tabaci (Genn.) biotipo B (Hemiptera: Aleyrodidae) | Thermal requirements of Bemisia tabaci (Genn.) B-biotype (Hemiptera: Aleyrodidae)
Albergaria, N.M.M.S. | Cividanes, F.J.
The development (egg-adult) of Bemisia tabaci (Genn.) B-biotype (=Bemisia argentifolii, Bellows & Perring), was studied in field conditions and in incubators at constant temperatures (15, 20, 25, 30 and 35 +/- 1 degrees C), using soybean, Glycine max (L.) Merrill, Msoy 8001, as host plant. The temperatures threshold (Tb) and the thermal constant (K) for egg, nymph and life cycle (egg-adult) were 11.1 degrees C/98.8 degree-days; 6.8 degrees C/383.8 degree-days and 8.3 degrees C/472.6 degree-days, respectively. At the temperatures of 15 degrees C and 35 degrees C, insect viability was smaller. In the field, 70% of the adults emerged after 413,2 degree-day were accumulated. The degree-day pattern used was adequate for the previewing Bemisia tabaci B-biotype adult occurrence in field, and it can also be used to determine the number of generations in different areas of the country.
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