Abstract
Endogone spores and wheat roots were recovered from soil by wet sieving. Spore numbers changed little from December to June, greatly increased in July, and began to decrease in September. Formalin applied in 1967 decreased the number of spores present in 1968, more in soil not previously given formalin than in soil given formalin in 1964 and 1965. Plots without nitrogen and other fertilizers consistently contained more spores than plots with fertilizers. Vesicular-arbuscular mycorrhizal infection was sparse in May and increased during the summer to a peak in September. It was most abundant in plots containing most Endogone spores. Four spore types occurred in one Rothamsted wheat field, but only one type was found in a nearby wheat field. The increases in spore numbers and mycorrhizal infection during the summer suggest that Endogone has little effect on wheat during the spring period of rapid root and shoot development before flowering.
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