ISSN:
1365-3059
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Observations in south Wales during 1971–78 on population changes in the cyst nematodes G. pallida (Stone)-Behrens Pal and G. rostochiensis(Woil.) Behrens Rol on early potatoes grown in concrete-bounded microplots confirmed that populations can be controlled by early harvesting. When potatoes were planted on 11 Match, harvesting 83 days later led to a decline in the population density of G. pallida in every year except 1976, which was exceptionally warm. The best estimate of the rate of decline was 55 per cent per annum. Harvesting after 91 days resulted in population densities otily slightly less than harvesting after 103 or 120 days, when population densities fluctuated around an equilibrium of 120 eggs/g soil. Sitnilarly, when plots infested with G. rostochiensis were harvested after 83 days, population densities declined. Harvesting after 91 days resulted in fluctuations about an equilibrium of 7 eggs/g soil and after 103 and 120 days around an equilibrium of 120 eggs/g.Females of G. pallida developed faster and produced eggs sooner than those of G. rostochiensis over the spring temperature range. Therefore, early harvesting would favour G. pallida and, if done routinely, would lead to the selection of this species and the replacetnent of G. rostochiensis. Harvesting a fixed number of days after planting would probably give satisfactory population control in most years, but harvesting on the basis of accumulated temperature above a known basal development temperature would probably be better, especially in years in which, the temperature departs appreciably from the average.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-3059.1981.tb01260.x
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