Seven watermelon materials with different resistances to fusarium wilt were used as parents to study the inheritance rule of resistance to fusarium wilt by Griffing's diallel crossing systemⅡ.The inheritance of resistance to fusarium wilt in watermelon was controlled by recessive polygene and conformed to the additive-dominance model.Additive effect played a more important role than dominant effect did.The susceptibility was partially dominant,with dominant gene showing the effect of increasing susceptibili...