HOT WATER & CHEMICAL DIPS STEAM STERILIZATION ROOT PRUNING

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Presentation transcript:

NEM 204 - PHYSICAL METHODS: HOT WATER & CHEMICAL DIPS STEAM STERILIZATION ROOT PRUNING (SOIL SOLARIZATION) 125F - 10 MINUTES 125F - 20 MINUTES 48

HOT WATER TREATMENT: TEMPERATURE & TIME NEEDED DEPEND ON NEMATODE SPECIES CROP VARIETY OR CULTIVAR ACCURATE TIME AND TEMPERATURE CONTROLS ARE NEEDED TOO HIGH OF A TEMPERATURE OR TOO LONG OF AN EXPOSURE PERIOD CAN DAMAGE PLANT MATERIAL TOO SHORT A TIME PERIOD OR TOO LOW A TEMPERATURE MAY NOT KILL NEMATODES MAY AGGRAVATE FUNGAL PROBLEMS

COMPARISON OF TIME AND TEMPERATURE NEEDED TO KILL STEM AND BULB NEMATODE AND FOLIAR NEMATODE 42C = 107.6F 44C = 111.2F 44.4C = 112F 46C = 114.8F 46.1C = 115F 47.7C = 118F 48C = 118.4F 49.4C = 121F MORTALITY (%)

GRAPE ROOTSTOCK HOT WATER TREATMENT:

STRAWBERRY PLANT HOT WATER TREATMENT:

STRAWBERRY PLANT HOT WATER TREATMENT:

MONITORING HOT WATER TREATMENTS:

STEAM STERILIZATION

STEAM STERILIZATION

ROOT PRUNING

(SOIL SOLARIZATION)