A biotype of Stellaria media (L.) Vill. has been identified that is highly resistant to the herbicide chlorsulfuron. Resistance is due to an altered acetolactate synthase (ALS) that is much less sensitive to chlorsulfuron than the ALS from the susceptible (S) biotype. The S biotype was extremely sensitive to D489 (N-[2,6-dichlorophenyl]-5,7-dimethyl-1,2,4-triazolo[1,5a] pyrimidine-2-sulfonamide...

Bemisia tabaci (Genn.) was considered a secondary pest in Brazil until 1990, despite being an efficient geminivirus vector in beans and soybean. In 1991, a new biotype, known as B. tabaci B biotype (=B. argentifolii) was detected attacking weed plants and causing phytotoxic problems in Cucurbitaceae. Nowadays, B. tabaci is considered one of the most damaging whitefly pests in agricultural syste...

T lymphocytes purified from lymph nodes and spleens of chancre-immune, inbred strain 2 guinea pigs, when infused into syngeneic guinea pigs, conferred protection against challenge with Treponema pallidum subsp. pallidum Nichols. No protection was conferred by similar injections of cell suspensions from normal guinea pigs or guinea pigs immunized with T. phagedenis biotype Reiter or T. pallidum-...

The whitefly, Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae) biotype B, is one of the most destructive invasive pests of field and glasshouse crops, and has a high tolerance to heat. Our previous work found that whitefly females are more heat tolerant than males. In the present study, real-time PCR and double-stranded RNA (dsRNA) methods were used to explore the role of heat shock protein ...

The whitefly, Bemisia tabaci, B biotype (syn. B. arentifolii Bellows and Perring) (Homoptera:Aleyrodiae), is a major problem in agroecosystems throughout ropical and subtropical regions of the world. Large opulations of whiteflies reduce crop yields, cause conamination of plant parts with excreted honeydew, and ct as vectors of Begomoviruses and other plant viuses that cause serious economic lo...