Egg hatch response of cyst nematodes Heterodera Schachtii and H.Carotae to raising temperatures

An in vitro study was conducted to investigate the effect of soil exposure for 2 - 2,048 hours to a 20 - 45 °C temperature range on the hatching behaviour of eggs of the cyst nematodes Heterodera carotae and Heterodera schachtii. A complete mortality of H. carotae eggs occurred for treatments from 512 h at 40 °C to 64 h at 45 °C, whereas almost 99% of H. schachtii eggs were killed by 256, 128 and 16 h exposures at 40, 42.5 and 45 °C, respectively.