1Institute of Medicinal Plant Development， Chinese Academy of Medical Sciences and Peking Union Medical College，
Beijing 100193， China； 2Institute of Botany， Chinese Academy of Sciences， Beijing 100093， China； 3Beijing
TEPEC Sunshine Science and Technology Cooperation， Beijing 100086， China
Abstract：This study tries to control the root-knot nematodes of vegetables by physical methods．
A soil treat machine of 20 kW microwave with 915 MHz frequency was designed and produced．This machine
conducted a field test successfully．The result indicated that in greenhouse microwave treatment on
soil could significantly reduce the number of root-knot and root-knot index of melon at the level of 60 seconds,
while in pot experiment only 10 seconds on cucumbers could very significantly control root-knot nematodes．
In greenhouse，microwave treatment did not affect melon plant height，basal stem diameter，fruit
sugar content，fruit hardness and shape index. There were not significant differences with those of the contrast．
High power microwave had significant control effect on vegetable root-knot nematodes in greenhouse，
but it costs huge energy，should be improved to reduce energy co st and enhance its efficiency.
