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Motility in Relation To Hatching of Eggs of Heterodera Avenae

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For more content, see Nematology.

Two factors were important in eclosion of larvae of H. avenae, motility and use of the stylet. Eclosion differed from that described for H. rostochiensis. Hatched larvae had periods of motility and quiescence at constant temperatures of 20-25°; motility could be initiated or increased by rise in temperature following a cold period but gradually diminished during storage at higher constant temperatures. A rise in temperature following a cold period also initiated movement of a small proportion of unhatched larvae and some of these eventually hatched but most became quiescent again. The majority of unhatched larvae failed to respond to the temperature change. Larvae in eggs which had been induced into dormancy by temperature changes failed to respond. The relation of these results to phases 1 and 2 of hatching is discussed. In sand, initial rate of migration was faster at higher constant temperatures (15-25°) but fewer larvae migrated than at lower temperatures. These results may be explained by quiescence of larvae at the higher constant temperatures.

Affiliations: 1: Waite Agricultural Research Institute, Adelaide, South Australia 5064


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