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The Biology of Heterodera Carotae

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For more content, see Nematology.

The biology of Heterodera carotae was investigated under laboratory and field conditions in Italy. Juveniles emerged from cysts all the year round and in greatest numbers (37.6-40.6%) at 15-20°C. Egg hatch was also substantial at 5-10°C, but negligible at 25°C. The age of carrot plants affected hatch and most juveniles (67-80.4%) emerged in root leachate from 5-7 week old carrots. Forty six per cent of the eggs from the egg masses were still viable at the end of the summer, but in November only 7 % of the eggs in soil were eggs from egg masses. Invasion of carrot roots by juveniles occurred over a range of temperatures from 8 to 20°C, but no nematode development was observed at 8°C. Heterodera carotae required 26 and 36 days to develop females and cysts at 20°C, when 260 and 360 day degrees above 10°C, respectively, had accumulated. Second stage juveniles appeared within egg masses and cysts after an accumulation of 510 and 570 day degrees above 10°C, respectively. Two generations can be completed by the nematode during a carrot growing season and no nematodes invade carrot roots in summer.

Affiliations: 1: C.N.R. - Istituto di Nematologia agraria, Bari, Italy


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