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The decline of a pea root eelworm (Heterodera göttingiana Liebscher) population in the absence of host plants

Published online by Cambridge University Press:  27 March 2009

F. Moriarty
F. Moriarty
Affiliation:
School of Agriculture, University of Cambridge
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Extract

1. The decline of a pea root eelworm (Heterodera göttingiana Liebscher) population, of which most eggs were formed in 1955, was measured annually from 1955 to 1958 in twenty-two microplots containing loamy sand, and measurements were continued in one of these microplots from 1960 to 1962.

2. Sampling errors increased when egg populations were more than 4 years old.

3. Two crop rotations (fallow, and maize, fallow, carrots) had no effect on decline rate from 1955 to 1958, nor did initial eelworm density.

4. After 3 years the egg population was still 48% of that in 1955. Subsequently the population declined on average by more than 50% per annum. It is suggested that host crops should not be grown more than once every five years.

5. Cysts declined more slowly, with a mean annual rate of 26%.

6. A sharp decline in eggs during the first year followed by at least one year's relative quiescence may be general in Heterodera species; with H. göttingiana unexpected crop failures may be associated in part with the prolongation of this relative quiescence for more than 1 year.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 61 , Issue 1 , August 1963 , pp. 135 - 138
Copyright
Copyright © Cambridge University Press 1963

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References

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