EFFECTS OF 4''-DEOXY-4''-EPIAVERMECTIN-B1 HYDROCHLORIDE (MK-243) ON GYPSY-MOTH (LEPIDOPTERA, LYMANTRIIDAE)

For 3rd instar Lymantria dispar, LD50s of MK-243 were 5.6, 1.1 and 0.32 μg/g after 1, 2, and 5 d, respectively. LC50's when 3rd instars were exposed to residues on poplar foliage for 72 h were 0.20. 0.12 and 0.07 ppm at 0, 1 and 5 d following exposure, respectively. Hatch of dehaired eggs and intact egg masses was reduced as much as 75% by 10, 5, or 1 ppm. At 10 ppm, all neonates died after eclosion; 50% of neonates treated with 5 or 1 ppm died following eclosion. -from Authors