Influência da teia de Oligonychus ilicis (McGregor) (Acari: Tetranychidae) sobre os fitoseídeos predadores associados

Abstract

Influence of the Webbing Produced byTo spin the web, 15 adult females were put on each experimental unit for 24h; females were then removed, leaving only the web, and predators and prey to be tested were introduced. Predation was assessed after 24h. In the presence of webbing, the consumption of eggs, larvae and nymphs by I. zuluagai and eggs and larvae by E. citrifolius was lower. For A. herbicolus, egg predation was lower, but larval predation did not vary significantly and predation of nymphs and adults was higher in the presence of webbing. Predators as a whole were more efficient consuming larvae regardless of the presence of webbing. Considering the stages of O. ilicis altogether, webbing reduced the predation potential of I. zuluagai and E. citrifolius, but not of A. herbicolus.

Biological Control of Southern Red Mite, <i>Oligonychus ilicis</i> (Acari: Tetranychidae), in Coffee Plants

“…Considering the phases of O. ilicis altogether, the web nest produced by them can reduce the predation potential of I. zuluagai and E. citrifolius, but not that of A. herbicolus [17].…”

“…At the levels of 15 and 120 pest mite per leaf tested, the rate of photosynthesis was reduced to 37% and 50%, re- however, a variation in species type and quantity may occur according to the coffee-growing region and time of the year [13]. Another phytoseiid, Euseius concordis (Chant), is also a substantially abundant species in coffee plants in the states of São Paulo and Minas Gerais [14] [15].…”

Resistance to red mite in Coffea arabica genotype introgressed with Coffea racemosa genes

“…The red mite (Oligonychus ilicis) is considered an important pest for C. canephora, which causes economic losses more frequently in hotter and drier regions (Matiello et al, 2016). This pest also occurs in C. arabica and it can cause losses of up to 50 % in productivity in areas with high infestation and without chemical control (Franco et al, 2009). O. ilicis is a small arachnid of approximately 0.5 mm in length, with females with dark red coloration and males lighter and smaller (Malavolta et al, 1993).…”

“…If there is no control, the mites can infest the entire crop. The leaves decrease in size and the photosynthetic activity, leaf fall and losses in the production (Franco et al, 2009). The attack of the red mite usually occurs in clumps of plants.…”

Biologia e tabela de vida do ácaro-vermelho Tetranychus bastosi em pinhão-manso

“…A principal característica dos ácaros da família Tetranychidae é a produção de teia, cuja principal função é a proteção dos ovos contra a dessecação e o forrageamento por predadores (Sabelis & Bakker, 1992;Venzon et al, 2009;Franco et al, 2010). Esses ácaros são classificados como polífagos e cosmopolitas.…”