Host Range, Biology, and Factors Affecting Survival and Reproduction of the Stubby Root Nematode

Populations of T. allius increased to levels nine times higher in Glurk tobacco plants infected with California rattle virus than healthy the same variety and age. christiei applications Hoagland's nutrient solution diluted up 50-percent concentration, whereas population densities were low at highest concentration (100 percent), water alone. Trichodorus did not seem be affected a large extent by similar solution. Soil type influenced populations allius; lighter soils conducive development while soil, coarse sand, white quartz sand used separately favorable for reproduction. Temperature proved one most important ecological factors nematode The optimum temperatures reproduction each species was as follows: christiei, 16° 24° C; porosus, and. T allius, 21° C. Extremes which different could reproduce also varied. an undetermined disease or condition seemed slow movement but have any apparent effect on rate Host ranges three studied. All polyphagous because 90 percent, percent 95 plant tested hosts respectively. Twenty-five 50 38 allius. A method is described keeping alive extended periods time.