Broccoli, Control of Lepidopterous Pests, 1993

Gary H. Sewell, Richard H. Storch
1994 Arthropod Management Tests  
BROCCOLI, CONTROL OF LEPIDOPTEROUS PESTS, 1993: The experiment was a randomized complete block with four replicates planted 26 May at Presque Isle, ME. The 3.0 m space between blocks and the 1.8 m space between the four-row plots were bare soil. Each 15.0 m replicate consisted of four double row beds with plant spacing of seven inches. Fertilization and cultivation practices were normal for the area. Foliar insecticide applications were made with a Century boom sprayer, three nozzles per row at
more » ... 6.3 kg/cm 2 pressure and 0.94 kl/ha. Numbers of insects were counted weekly on 20 whole plants in the middle beds of each plot. All materials were applied 26 Jul. Yield was taken 17 and 24 Aug by selecting heads at least 3 inches diameter from a 5 m section of the middle two beds of each replicate. Heads were trimmed to an 8 inch length, weighed and examined for insects. Analysis of variance was done and means compared using Fisher's LSD Test. The soil was classified as Caribou Loam, pH 5.2. Total monthly rainfall for Jun, Jul, and Aug was respectively 14.0, 5.0, and 7.6 cm. The average temperature for each of the same 3 months was 16.0, 18.5 and 19.0 deg. C. ICW and DBM numbers were low with DBM larvae comprising 9 1 % of the population in untreated plots. All treatments significantly reduced numbers of larvae in plant counts. ICW comprised 95% of the population of the larvae found in head counts and the two highest rates of Larvin having significantly lower numbers of insects. No phytotoxicity was observed.
doi:10.1093/amt/19.1.64 fatcat:xasi2qfbozbddpi6sciiqtxyr4