This information was provided by state coordinators and was collected from surveys of county agents, extension specialists, private consultants and research entomologists. All data are averaged over a total reporting unit, state, etc. For example, if a unit report represents 100 acres and an 8% loss on 25 of these acres, then in the table summary this shows up as a 2% loss. ((.08 25)/100). This type of averaging is used for all data reported including yields and costs of control. Because of averaging and rounding some individual state summary numbers listed as '0' are slightly larger. Cost are averaged to the nearest cent, bales and acres to the nearest whole number, other numbers are rounded to the nearest .001. Bales are calculated at 480 pounds, and a cost of $0.70 per pound of lint is used in figuring costs.
Arthropod pests reduced overall yield by 6.61% in 1996. The bollworm/budworm complex was still the number one pest in the U.S. with a yield reduction of 2.37%. Seventy-seven percent (77%) of the U.S. cotton acreage was infested with bollworm/budworm in 1996, requiring 1.3 applications of insecticide per acre. These numbers are down and are influenced by the 1.86 million acres of Bt cotton which was planted in 1996. Only 54% of U.S. cotton was infested by boll weevil, yet it remains the strong number 2 pest at 1.86% yield reduction. Lygus (0.68%), aphids (0.48%),and thrips (0.40%) complete the rogues gallery for the top five insects of 1996. Total cost of management and loss to insects to the 1996 crop was $1.2 billion or $89.68 per acre. Of those costs approximately $45 are direct insect management costs and the other $44 is loss in yield.
*California - This estimate represents the San Jocquain Valley, only.