Pratylenchus Thornei - a Cause of Root Necrosis in Wheat

Author: Baxter R.I.   Blake C.D.  

Publisher: Brill

ISSN: 1875-2926

Source: Nematologica, Vol.14, Iss.3, 1968-01, pp. : 351-361

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Abstract

Invasion of wheat roots by Pratylenchus thornei Sher & Allen under field conditions, as well as in the absence of other microorganisms, caused lysis of cells, cavities, and eventually, destruction of the cortex. The number of P. thornei in roots increased exponentially with time. There was a significant linear regression between the logarithm of the number of nematodes in the inoculum and the logarithm of the number that invaded wheat roots (P<0.005). in="" a="" clay="" loam,="" the="" number="" of="" p.="" thornei="" decreased="" rapidly="" during="" storage="" in="" the="" absence="" of="" a="" host="" for="" 5="" weeks="" and="" then="" more="" slowly="" for="" 50="" weeks.="" this="" decline="" was="" more="" rapid="" at="" 30°c="" than="" at="" 10="" or="" 20°c="" while="" at="" 40°c="" there="" were="" no="" survivors="" after="" 2="" weeks.="" air="" drying="" the="" soil="" from="" 19.5="" to="" 5.0%="" w/w="" moisture="" killed="" 78.7%="" of="" the="" p.="" thornei="" present.="">