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Effect of Temperature On Hatching of Eggs of Heterodera Avenae

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Hatching of eggs of Heterodera avenae can be divided into two phases: the first, thought to be a period of larval development, has an optimum of about 10°; the second, of relatively short duration, and concerned with eclosion, has an optimum about 20°. These optima are independent of the temperature at which the other phase is undergone. Both phases occur over the range 5° to 20° and rate of hatching at constant temperature is the resultant of the different times taken to complete each phase. Alternating temperatures failed to hasten phase 1 development. Cumulative hatch with time at 10° followed a symmetrical sigmoid curve, the flex point of which coincided with 50% of "total" hatch between 8 and 9 weeks when maximum numbers of eggs would have completed their phase 1 development; of the times when eggs were moved from 10° to 20°, the greatest hatching response was obtained after 7 weeks at 10° as this time was closest to the flex point. Some eggs were induced into dormancy by warmth following a period of cold; the proportion induced was influenced by time at the low temperature and magnitude of the temperature rise, but induction of this dormancy could be prevented by alternating temperatures daily or 4-daily. Hatching in soil at field capacity was similar to that in water, and was not influenced by the presence of host roots, but more eggs hatched in unsterile than in sterilized soil. The significance of these results to activity of H. avenae and damage to crops in the field in southern Australia is discussed.

Affiliations: 1: South Australian Department of Agriculture, Gawler Place, Adelaide, South Australia 5001,; 2: Department of Plant Pathology, Waite Agricultural Research Institute, Glen Osmond, South Australia 5064

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/content/journals/10.1163/187529271x00242
1971-01-01
2016-12-08

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