DIEL PERIODICITY AND TRAP BIAS IN STICKY TRAP SAMPLING OF SHARPNOSED LEAFHOPPER¹ POPULATIONS^2,3

Sharpnosed leafhoppers, Scaphytopius magdalensis (Provancher), exhibit a diel periodicity characterized by morning and evening peaks of flight activity. Adults are most commonly found on blueberry plants at night; they apparently seek shelter during the day and return to their host plants around dusk. Flight activity during midday and early afternoon is usually correlated with high temperature and low humidity. Most local flight activity occurs from 0 to 50 cm above the soil surface and is significantly affected by bush height.