The effect of Profenofos was studied in experimental
plots in the subdistrict of Cipanas, Cianjur
(West Java) from July until October 1999. Potatoes
were planted in five 40665 m plots. Two plots were
treated with insecticides, while three others
were designated as controls. The formulation used
was Profenofos 500 g/l (Curacron 500 EC) with a
dosage of 1 – 1.6 l per ha applied with a knapsack
sprayer. The insecticide was applied twice a week
from 5 to 11 w.a.p. All plots were also sprayed with
Mefenoxam 4% and Mancozeb 64% (Ridomilgold
MZ 4/64 WP) at 8 and 9 w.a.p. to control late blight,
Phytophthora infestans.
Adult L. huidobrensis population densities were
estimated from fly numbers captured on yellow
sticky traps. Once a week, two yellow cylinder
sticky traps (9612 cm), attached to bamboo
stakes, were positioned 30 cm above the ground
in each plot for 1 week, starting at 5 w.a.p. Traps
were replaced weekly and the number of flies
counted.