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Growth and Yield of Oats At a Range of Heterodera a Venae Densities and Under Different Watering Regimes

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For more content, see Nematology.

There was no difference in relative size of oat plants at different initial densities of Heterodera avenae in well watered pots and pots which received restricted quantities of water in two experiments in successive years, one at about 20° (temporarily as high as 30°) and the other at 5° to 20°, until panicles began to emerge. Tolerance limits (according to the equation y = m + (1-m)zP-T for P> T and z-T = 1.05) were 2 to 6 juveniles/10g soil during the first 2 months and possibly slightly larger at about 20° than at 5° to 20°. Drought accelerated but nematode attack retarded the emergence of the first panicles. Final plant weights showed no effect of watering regime on the tolerance of oats to H. avenae attack in the first and a slightly higher tolerance when watering was restricted rather than with liberal watering in the second experiment. No cysts were formed in the first experiment (high temperature). Multiplication rates at initial densities < 10 eggs/10 g soil in the second experiment were five times larger in well watered pots than in those with a restricted water supply. Probably temporary drought conditions enhanced the under-population effect associated with small nematode densities in the second experiment.

Affiliations: 1: Research Institute for Plant Protection, Wageningen, The Netherlands


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