00388nam a2200133Ia 4500008004100000100001500041245005200056260006400108300001000172650002000182650001800202650001700220700001700237220216s9999    xx            000 0 und d  aPeries O S 0aProblems of crop disease control with chemicals  bRubber Research Institute of Ceylon Quarterly Journalc1968  a44-48  aDisease control  aOidium heveae  aPhytophthora  aDe Silva R L