MORTALITY AND HONEYDEW PROFILES OF NEPHONTETTIX-CINCTICEPS UHLER (HOMOPTERA, CICADELLIDAE) SUPPLIED WITH A LEAFHOPPER-RESISTANT RICE VARIETY

Almost all the green rice leafhopper Nephotettix cincticeps Uhler plac ed on seedlings of Norin-PL6, a newly established leafhopper-resistant rice variety, died within 6 days. About 90% of nymphs placed on a rel ated variety, Toyonishiki, survived and molted to further nymphal inst ars. Daily mortalities on Norin-PL6 seedlings were completely cancelle d if the survived nymphs were transferred to Toyonishiki seedlings. A large amount of amino acids and sugars (mainly sucrose, glucose and fr uctose) were found in honeydew of adult males fed on Toyonishiki, but non-detectable or only faint levels were in those from Norin-PL6.