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Development of the Nematodes Meloidogyne Hapla Chitwood and Heterodera Trifolii Goffart in White Clover

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The development of Meloidogyne hapla and Heterodera trifolii was monitored and related to heat accumulation. Numbers of nematodes within defined developmental categories were recorded each 4 days. The number of degree days above 10°C for development to females producing eggs were 281 and 244, respectively, and for development to the appearance of distinct juveniles inside eggs (taken as completion of one generation) were 407 and 310, respectively. In another experiment, plant size and numbers of M. hapla galls and H. trifolii cysts were determined in pots which had been inoculated with nematode eggs in a dilution series. Plant size declined in a sigmoid curve pattern for both species and curves were fitted to the relative means. Numbers of H. trifolii cysts peaked at an inoculum rate of 6,600 eggs per 180 ml pot but the peak of M. hapla gall numbers was less distinct at 1,100 eggs per pot and fell away with increasing inoculum more slowly than was the case with H. trifolii. Mixing M. hapla inoculum with soil or injecting inoculum into a hole in the soil surface gave similar final populations in roots.

Affiliations: 1: Department of Scientific and Industrial Research, Plant Protection, Palmerston North, New Zealand


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