Yield Loss in Hydroponically Grown Lettuce Attributed to Subclinical Infection of Feeder Rootlets byPythium dissotocum
- 1 January 1986
- journal article
- research article
- Published by Scientific Societies in Plant Disease
- Vol. 70 (11) , 1053-1056
- https://doi.org/10.1094/pd-70-1053
Abstract
Pythium dissotocum, reported for the first time as a root pathogen of hydroponically grown lettuce, was responsible for significant yield reductions (35-54 and 12-17% reductions at 18 and 28 C, respectively) in the absence of visible root or foliar symptoms. The fungus was isolated from 92% of the rootlets assayed and occupied about 75% of the total root length assayed. Microscopic examination of infected roots revealed haustorialike fungal structures within healthy-appearing epidermal cells. P. dissotocum, in addition to P. uncinulatum, P. irregulare, P. sylvaticum, P. violae, P. catenulatum, and P. rostratum, was also consistently isolated from healthy-appearing feeder rootlets collected from field-grown head lettuce plants.Keywords
This publication has 5 references indexed in Scilit:
- Fungal Infection of Feeder Rootlets of AlfalfaPhytopathology®, 1985
- Root Rot of Hydroponically Grown Spinach Caused byPythium aphanidermatumandP. dissotocumPlant Disease, 1984
- Incidence ofFusariumandPythiumspp. in Peach Feeder Roots as Related to Dibromochloropropane Application for Control ofCriconemella xenoplaxPlant Disease, 1984
- Effects of Pythium species on the growth of apple and their possible causal role in apple replant diseaseAnnals of Applied Biology, 1981
- Effects ofPythium arrhenomanesInfection and Root-Tip Amputation on Wheat Seedling DevelopmentPhytopathology®, 1981