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Effects of Three Nematicides on the Physiology of Rose Infected with Meloidogyne hapla. Ephraim Epstein, Division of Nematology, The Volcani Center, Agricultural Research Organization, Bet Dagan, Israel; B. Bravdo, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel. Phytopathology 63:1411-1414. Accepted for publication 14 May 1973. DOI: 10.1094/Phyto-63-1411.

The nematicides DBCP, Mocap, and Temik reduced considerably the number of root-knot nematode galls (Meloidogyne hapla) on roses. Rates of 0.5 and 1 liter/hectare of DBCP and of 1 kg/hectare of Mocap or Temik reduced photosynthesis and transpiration and increased leaf resistance to CO2 uptake and water vapor loss. Photosynthesis was not reduced significantly per mg of chlorophyll, but it was reduced more than the calculated reduction due to stomatal closure, which suggests an increase in mesophyll resistance. Reduction in net photosynthesis was followed by reduction in flower yield after treatment with the higher rate of DBCP and Mocap. The method described offers the means of an early detection of toxic symptoms due to nematicide application.

Additional keywords: Rosa multiflora, ventilated diffusion porometer, phytotoxicity, CO2 and water vapor exchange, diffusion resistance, mesophyll resistance.