HETERODERA MAJOR O. SCHMIDT 1930 ON CEREALS - A POPULATION STUDY 1) BY J. J. HESLING Rothamsted Experimental Station, Harpenden The increase of populations of certain Heterodera species, namely, ros tochiensis (Wollenweber 1923) and H. , schachtii (Schmidt I87I ) has been shown to be dependent on the initial infestation, low infesta- tions favouring high increases and vice versa (CHITwooD and FELD- MESSER 1948, FENWICK and REID It?53, GOFFART 1952, SCHMIDT I955) · CHITWOOD and FELDMESSER (1948), PETERS (1954) and LOWNSBERY and PETERS (1955) have observed that very low popula- tions of I-I. rostochiensis and I-1. tabacuin may increase host plant growth. These phenomena have not been investigated in detail in the case of H. major, nor has any plant which produces a root diffusate hatching stimulus for this species yet been demonstrated (FRANKLIN 1951, HESLING 1957). It has been shown that the larvae of H. major enter oat roots in March, that the invasion of the roots reaches a peak in April and May and falls off in July (SCIIMIDT 1931). Therefore, since H. major larvae continue to emerge over a period of several months during spring and early summer, there may be differences be- tween this
Nematologica – Brill
Published: Jan 1, 1957
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