Apple, Ovicidal Effects of Methomyl (Lannate 1.8 L) on Insect and Mite Pests, 1981

To assess the effects of methornyl on the eggs of aphids and mites, seven treatments and a water control were used in each of two experiments. On Mar 5, apple twigs bearing overwintering generation P. ulmi eggs were collected from the research orchard at Steeles Tavern, VA and brought back to the laboratory for processing. Twigs were cut into one-inch sections. Each twig section contained a variable number of eggs ranging from 10 to 35. The sections were affixed to double-stick Scotch tape on a microscope slide. One section was used per slide and three replicates were used per treatment. The slides were dipped in the respective treatment solutions and placed in an open-air insectary. Data were recorded (number of hatched eggs) when control eclosion ceased. Apple twigs bearing eggs of A. pomi and D. plantaginea were collected on Mar 5 from the research orchard at Steeles Tavern, VA. The eggs were processed using the same procedure as that described in Experiment 1. The number of eggs per section ranged from 12 to 43. Methornyl does not appear to exhibit any ovicidal activity against eggs of P. ulmi at any commercially-applicable rate. Methornyl appears to show promise for use as an ovicide against aphid eggs during the silver-tip to green-tip stage of bud development.