Summary: EVALUATION OF INSECTICIDES TO CONTROL PHYTOPHAGOUS MIRIDAE 2004
David P. Kain, Dept. of Entomology, NYSAES, Geneva, NY
We have determined, through various experiments over a number of years, that the most
effective insecticide application timing for control of mullein plant bug and apple brown bug is
at the pink stage of blossom development. Tests were set up in 2004 to compare the
effectiveness of Lorsban 4EC, Actara 25WDG, and Assail 70WP, all applied once, at pink.
Insecticides were applied at 3 sites in Wayne Co., NY. Despite preliminary sampling that
indicated each site would have sufficient numbers of insects to provide a good test, hatch was
adequate in only one site, on the Simpelaar farm. Treatments were applied to 8 'Red Delicious'
trees (4 trees x 2 rows) per plot and were replicated 4 times. All were applied with a handgun
using a Rears Nifty-Pul-Tank sprayer operating at 300 psi. Limb-tap samples were taken every
14 days starting at Full Bloom and ending at Petal Fall, at which time the grower applied
another insecticide, according to normal practice. Fruit damage was assessed on 2 June (after
"June drop"). Ten fruits on each of 5 limbs (50 fruits per tree) were examined for damage, which
was classified as follows: Clean = no damage, Fancy = 1 or 2 superficial blemishes, No. 1 = 2 or
3 superficial blemishes or 1 large blemish, cull = > 3 superficial blemishes or >1 large blemish or
distorted fruit. Data (proportion damaged fruit) were transformed by arcsine square root and
analyzed using Fisher's Protected LSD test.
Egg hatch was somewhat later, in relation to Full Bloom, than is considered "normal".
Generally, peak hatch would occur between Full Bloom and about 50% Bloom. Damage is