Detection of, and sampling procedures for, the citrus blackfly in urban southern Florida

Abstract

Summary The dispersion pattern of the citrus blackfly (CBF)Aleurocanthus woglumi Ashby on urban citrus trees was studied in southern Florida. There was no usable correlation (r2=0.41) between the % of older leaves infested with CBF versus that on the newest mature flush, but there was a strong correlation (r2=0.87) between the % of leaves in the newest mature flush infested with CBF and loge(x¯+1), where truex¯ is the number of egg spirals of CBF/leaf on the same leaves. CBF egg spirals are distributed among the flushes in groups rather than singly and the flushes are not over‐dispersed. Visual surveys proved superior to sticky traps for the detection of CBF at low densities (<5% leaves infested) on citrus trees in an urban setting. A sampling procedure is described herein based upon visual surveys.

Distribution and Sampling of the whiteflies <I>Aleurothrixus floccosus</I>, <I>Dialeurodes citri</I>, and <I>Parabemisia myricae</I> (Homoptera: Aleyrodidae) in Citrus in Spain

“…In citrus, Argov et al (1999) found, with D. citri, b values of 1.77 for eggs, and between 1.35 and 1.55 for different nymphal stages. Dowell and Cherry (1981) studied the distribution of Aleurocanthus woglumi egg spirals on citrus trees Þnd-ing an aggregated distribution among the ßushes.…”

“…Most of these studies have been developed on two horticultural pests, Trialeurodes vaporariorum (Westwood) (Rumei 1982, Yano 1983 and Bemisia tabaci (Gennadius) (Ohnesorge et al 1980, Yano 1983, Von Arx et al 1984, Naranjo and Flint 1994. In citrus the dispersion pattern of Aleurocanthus woglumi Ashby has been determined Fitzpatrick 1979, Dowell andCherry 1981). Recently, Argov et al (1999) studied the spatial distribution and sampling of D. citri.…”

Pest survey card on Aleurocanthus spiniferus and Aleurocanthus woglumi

“…Visual surveys were more efficient than sticky traps (see below) for detecting A. woglumi at low densities (<5% leaves infested) on citrus trees in urban areas (Dowell and Cherry, 1981). Visual surveys detected the first infestation with A. spiniferus in Italy (Porcelli, 2008).…”

Comportamento de oviposição da mosca-negra-dos-citros Aleurocanthus woglumi (Hemiptera: Aleyrodidae) em plantas cítricas

“…A mosca-negra-dos-citros tem característica de realizar a postura em forma espiral e de forma agrupada (Dowell & Cherry 1981), variando de 35 a 50 ovos por postura, sendo estes depositados na superfície inferior das folhas (Nguyen e Hamon 1993).…”