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An Analysis From Aerial Photography of the Spread of Seed-Borne Ditylenchus Dipsaci in Lucerne

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image of Nematologica
For more content, see Nematology.

Aerial photography of three fields of lucerne in the spring of 1978 and 1979 were used to monitor the spread of a seed-borne infestation of Ditylenchus dipsaci. Analysis suggests that there was an aggregated distribution of the foci two months after sowing with a better fit to a negative binomial than to a Poisson distribution over the subsequent 3 years. Results from using an image analyser suggest that the infestation develops by the generation of additional colonies from the original foci and by the progressive expansion of the area damaged by an established colony. There was a four to five fold annual increase in the number of foci, their mean size and the area of the field that was damaged during the initial years of the infestation. In these fields moving seemed to be the main factor in dispersal but higher rates of colonization may occur when surface drainage or the wind contribute to this process.

Affiliations: 1: Department of Pure & Applied Zoology The University of Leeds LS2 9JT; 2: Department of Entomology, ADAS, Lawnswood, Leeds, LS16 5PY


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