SYNERGISM BETWEEN PRATYLENCHUS PENETRANS (COBB) AND VERTICILLIUM ALBO-ATRUM R. & B. IN EGGPLANT WILT

Abstract

Studies conducted in steam-sterilized soil inoculated with Verticillium alboatrum and Pratylenchus penetrans demonstrated a synergistic relationship between fungus and nematode. At low and intermediate levels of Verticillium inoculum, the nematode increased wilt and the increase may be a function of the number of nematodes present. Except at the high inoculum levels of Verticillium, significantly larger numbers of P. penetrans occurred in eggplant roots in the presence than in the absence of the fungus. The nematode alone had no adverse effect on root condition or growth of eggplant.

Interaction Between Pratylenchus coffeae and Pythium aphanidermatum and/or Rhizoctonia solani on Chrysanthemum*

“…An increase in the final density of Pratylenchus spp. on different hosts (MCKEEN and MOUNTAIN 1960, MICHELL and POWELL 1972, MOUNTAIN and MCKEEN 1962 and of root-knot nematode on chrysanthemum (JOHNSON and LlTTRELL 1969) infected with vascular wilt fungi have been reported, increase in numbers of Pratylenchus coffeae on chrysanthemum infected with R. solani was also recorded in the present studies but it was found to be reduced in presence of P. aphanidermatum (Table 1). P. aphanidermatum is reported to suppress rootknot nematode on chrysanthemum (JOHNSON and LITTRELL 1970), BURPEE and BLOOM (1978) observed suppression in the population of Pratylenchus penetram on potato infected with Verticillium wilt fungus.…”

Verticillium wilt of potato in southwestern Ontario and survival ofVerticillium albo-atrumandV. dahliaein field soil

“…Sam ples of lower parts of stems of wilted plants were plated on moist filter paper (McKeen & Thorpe 1971 ) to determine the Vertkillium species present. During late August, after the tops had matured, the plots were harvested and the yields of tubers were determined by weight.…”

The association of root-lesion nematodes with reduced growth of tobacco in the Nelson district

“…have been associated with a disease of tobacco called brown root rot (Jenkins 1944;Koch and Stover 1950;Mountain 1954). Also P. penetrans has been shown to increase the incidence of Verticillium wilt in eggplants if the level of Verticillium albo-atrum R. & B. in the soil is low (McKeen and Mountain 1960). Similarly, Pratylenchus spp.…”