Effects of Oxygen and Temperature on the Activity and. Survival of Nothanguina phyllobia
Abstract
The effects of oxygen and temperature on the activity and survival of infective forth-stage juveniles of Nothanguina phyllobia Thorne were examined in aqueous suspension. Rate of movement was not affected by a wide range of O[sub2] concentration (0.8-8.6 ppm). Activity decreased below 0.8 ppm 0 2, and at 0.15 ppm O[sub2] nematodes became motionless. Activity increased as a linear function of temperature up to a thermal optimum of 24 C; beyond 24 C activity decreased. Survival was greatly prolonged at low temperature. At 23 C, 50% mortality occurred within 7 d, whereas at 4 C, 70% survived after 98 d. Key words: oxygen, temperature, activity, survival, Nothanguina phyllobia, biological control of weeds.Downloads
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