Mortality and Honeydew Profiles of Nephotettix cincticeps UHLER (Homoptera: Cicadellidae) Supplied with a Leafhopper-Resistant Rice Variety

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