Study on cereal aphid resistance on three winter wheat cultivars introduced into China Acquisition of Transgenic Colour Cotton with a Trivalent Insect-resistant Gene STUDY ON THE RELATIONSHIPS BETWEEN MORPHOLOGICAL CHARACTERS OF WINTER WHEAT AND ITS RESISTANCE TO SITOBION AVENAE(F.) A FUZZY SYNTHETIC DECISION FOR THE RESISTANCE OF RAPE VARIETIES TO RAPE APHIDS Correlations between physical characters of wheat leaf hairs in SEM and the biological parameters of grain aphid Stiobion avenae