Resistance of transgenic betula platyphylla to the defoliator lymantria dispar

The paper report the results of study on the resistance of transgenic tree Betula platyphlla with BtC peptide and spider insecticide peptide gene to the defoliator Lymantria dispar , the result showed that the transgenic B . platyphylla could prolong the duration of L . dispar larvae obviously. The Developmental Relative Value of larvae of L . dispar from1st instar to 3rd instar feeding on birch positive to GUS or that negative to GUSwere 6618 , 7215 %;9015 , 9614 %;8116 , 9215 % , respectively. Larvae in the control could finish development normally but treated larvae didn’t develop to 5th instar. The transgenic tree could repress the pest larvae mass obviously. The mean body mass of the larvae after 40 d’s feeding on non-transgenic birch were 6175 and 7143 times of those feeding on two type of transgenic birch , respectively. The exuviations index of the larvae after 30d’s feeding on two type of transgenic birch were 21933 and 31038 respectively , both lower than that of control of 31323 , indicating transg