Mosca-negra-dos-citros (Aleurocanthus woglumi ashby, 1915) (Hemiptera: Aleyrodidae) determinação do nível de dano econômico em área comercial de laranja.

Abstract

The economic retum for citms plantings is atfected by marke. variables and biological factors, which Muences the tarmerv gains. Fe» agricultmal pests have their eeonomic injury levei (EU.) eslabhshed. The objective o thia research »as to determine the economic injmy levei and the inflnenee o„ the prodnctmty of orange treea caused by nymphs of citras black fly (diearoaMfar Ashby, 1915) (Hemiptera; Aleyrodtdae) on the city of Capitão-Poço, Pari State, using statistical analysis and damage torecast models. Different nymp densities of d. woglumi were maintained on orange trees b, using different dosage of insecticide m order to evaluate the relation of nymph density and producion loss. Nymph densides were monitored evety 15 days through counting those present on orange me leaves. Correspondence analysis was conducted and the number of nymphs and orange production were divided into groups, organized as high. av«age and low mfestatron and produetion. The regression analysis was nsed to detemine the relafion ofnymph density and the production (g) the orange plantings blocks. The results showed high leveis of nymphs are associated to low leveis of production. average leveis of nymphs are associated to average leveis of production and low leveis of nymph density are associated to high leveis of production. The economic injury levei range was tnfluenced by the orange market priee and control costs. According to these parameters the values of EU, where ttte average infestation cotresponded to 47.63% and 22.75 and 89.92 of variation% of plants mtested by nymphs of ctrus black fly. Using the obtained values ofthe EIL regression model was adjusted as Y — 97.39-8.43 x, to estunate any amount paid by the 20 kg box of oranges as well as the EIL suitable for such value