The attack of cotton bollworms
were found throughout the cotton season.
Others, however are thinking the mild winter could mean an increase in tobacco budworms and cotton bollworms
, meaning they're willing to switch to transgenic varieties this year.
The comparative analysis of field evaluations indicated that monocrotophos and endosulfan treated cotton provided good control of the cotton bollworms
. Data illustrated this trend as average square and boll damage of 2.88% and 3.16%, respectively, occurred in monocrotophos and endosulfan treated cotton fields, which were significantly lower than those on unsprayed cotton (6.22% damage) (Table I).
and budworms have developed resistance to many standard commercial insecticides," says Kirk, who is with the Areawide Pest Management Research Unit in College Station.
Artificial diet for rearing of cotton bollworms
was prepared in the laboratory following the method and ingredients used by Ahmed and McCaffery (1991).
The test distinguishes cotton bollworms
from their cousins, the tobacco budworm and groundcherry fruitworm.
(as it also attacks terminal shoots of cotton plants) all cotton bollworms
appeared at flowering stage.
To stimulate the production of sex pheromones, Teal applied the analog to the skin of tobacco budworms and cotton bollworms
. Both of these major cotton pests have adapted to commonly used chemical insecticides, making them less effective, notes Teal.
The study was conducted to determine the comparative infestation of cotton bollworms
viz., spotted bollworm (Earias vittella) against two transgenic Bt (FH-113, FH-114) (characteristics given below) and one conventional cultivar (FH-2015), which were chosen from a pool of varieties grown in the experimental area of Directorate of Cotton, Ayub Agricultural Research Institute, Faisalabad, Pakistan.