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Effect of Host and Environment On Some Aspects of the Biology of Heterodera Avenae

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Cysts of Heterodera avenae produced on the early maturing barley cultivar 2137, matured sooner, and rate of hatching of the freed eggs was faster than from those produced on the later maturing barley cultivar Prior, suggesting that time of hatching is related to maturity of the host. Irrespective of the temperature at which eggs were produced, subsequent hatch was incomplete, and hatching extended over a longer period than that taken for egg production. There was some evidence of an interaction between the temperature at which eggs were produced and the temperature at which they were hatched, on the extent of dormancy. By delaying the maturity of the host, rate of egg production was correspondingly slowed, but more eggs were eventually produced, indicating that rate of maturation of the host exerted a greater influence on total number of eggs produced by the female than did rate of egg production. Females had the capacity to continue producing viable, fully-differentiated eggs after removal from the host but this capacity declined as they approached their maximum rate of egg production. More undeveloped eggs completed their differentiation within females removed from the host, than as freed eggs. It was essential for the female, however, to continue feeding in order for all eggs to develop and survive.

Affiliations: 1: Department of Plant Pathology, Waite Agricultural Research Institute, Glen Osmond, South Australia 5064


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