Temperature Influence on the Potato Cyst Nematode (Globodera rostochiensis Woll. 1923) Development

Z. TRIFONOVA

Plant Protection Institute, BG-2230 Kostinbrod, Bulgaria

Abstract

TRIFONOVA, Z., 1999. Temperature influence on the potato cyst nematode (Globodera rostochiensis Woll. 1923) development. Bulg. J. Agric. Sci., 5: 863-866

From all environmental factors the most important influence on the development of the potato cyst nematode has the temperature. The inoculation of the plants is possible on the temperature rate over 10 0C. The temperature threshold for invasion is 14.2 0C. The parameters that determinate the biological possibilities of the species are inner and top threshold of development, i. e. 11.7 0.61 0C till 28 0C and the overall inner and top limits of the temperature optimum, i.e. 15.7 0C and 23.1 0C. The soil infection decreases when the temperatures are over 26.0 0C. The development period of the nematode from invasion larvae (L2) to sex matured female is 31-39 days from the date of infection when the temperature is 16.5 0C and 21-31 days when 26.2 0C. The conditions of development of the parasite in the field starts in May when the midlle soil temperature rates are more than 15.0 0C.

Key words: potato cyst nematode, hatching, root diffusate