抄録
After a 1-day acquisition access period sequential transfers of nfective Nephotettix virescens to rice seedlings at 30-min intervals for 15 hr indicated an intermittent or erratic pattern of transmission of rice waika virus. The transmission frequency of individual insects averaged 6.3, ranging from 1 to 16 out of 30 transfers. When infective N. virescens were transferred at 1-hr intervals for 15 hr, most of the insects displayed a similar intermittent or erratic transmission, although a few insects were consistent transmitters. Transmission frequency averaged 7.4, ranging from 2 to 15. Frequency of transmission was less for N. cincticeps, although the pattern of transmission was nearly the same. There was no significant difference in the frequency of transmission between 30-min and 1-hr trnasfer intervals for N. virescens. When different numbers of seedlings were given to a single insect in a tube, an increase in the number of seedlings exposed to the insects did not always result in a corresponding increase in the number of seedlings that became infected.
