ABSTRACT Vatiga manihotae (Drake 1922) (Hemiptera: Tingidae) is an important cassava pest due to the great potential damage and the increasing population in recent years. However, few studies about bioecology and control of the cassava lace bug have been conducted and their results don't provide adequate control strategies. An alternative to maintain the population below economic injury levels is through the adoption of host plant resistance. To improve the understanding about the bioecology and find new sources of resistance in cassava, the biological parameters and demographics of V. manihotae on five cassava genotypes (Santa Helena, MEcu 72, Col 22, Clone 02 and Clone 03) under controlled conditions (25±2°C, 14L/10D) were evaluated. Duration and viability of the stages, the period egg-adult, sex ratio, the pre-oviposition period, fecundity and longevity of male and female was determined, and a fertility life table was prepared. Insects fed on MEcu 72 showed increased nymphal, egg-adult, and pre-oviposition periods and reduced female fecundity and longevity in comparison to the other genotypes. Demographic parameters (Ro, rm, T, DT) showed a significant impact on the growth potential of V. manihotae fed on MEcu 72 indicating that the populations would diminish over time. The combined effect of these parameters indicated that MEcu 72 has resistance on V. manihotae specimens hindering their development.

Resumen El objetivo de este estudio fue desarrollar un método de cría de Bemisia tuberculata en plantas de yuca para la producción y el mantenimiento continuo de una colonia. La población inicial de B. tuberculata se obtuvo a partir de hojas recogidas de la planta con alta infestación de ninfas. Los adultos obtenidos fueron transferidos de la taza de plástico a jaulas de tul, en diferentes densidades. La densidad de 125 adultos de B. tuberculata por hojas fue el más adecuado para la cría. El método que se propone en este estudio ha demostrado ser eficaz y se recomienda, ya que el nivel de la población se mantuvo estable durante los experimentos.

Abstract The aim of this study was to develop a rearing method for Bemisia tuberculata on cassava plants that enables the production and ongoing maintenance of a colony. The initial population of B. tuberculata was obtained from leaves collected from plants with high nymph infestations. Emerging adults were transferred from plastic cups to voile cages in different densities. The density of 125 adults of the B. tuberculata per leaf was the most suitable for rearing. The rearing method proposed in this study has proven to be effective and is recommended since it allows for population levels to remain stable during experiments.

O cascudinho dos aviários é considerado um importante problema mundial no sistema de produção avícola, por infestar os aviários e ser potencial vetor de patógenos às aves e ao ser humano. O objetivo do trabalho foi avaliar em laboratório a atividade da torta de nim, Azadirachta indica A. Juss (Meliaceae) como forma alternativa de controle de Alphitobius diaperinus Panzer (Coleoptera: Tenebrionidae). A torta foi aplicada diretamente no substrato (ração para aves ou cama de aviário) na quantidade de 100g m-2 do produto. Foram verificados os efeitos letais e subletais da torta contra adultos do cascudinho dos aviários, sendo eles: ação inseticida, efeito na oviposição, repelência e efeito na alimentação. A utilização de torta de nim pareceu não afetar a sobrevivência dos insetos, porém, a avaliação do efeito repelente, atividade alimentar e oviposição foram influenciados, sendo observada redução de 23% na oviposição e 21% na atividade alimentar.

The lesser mealworm is one the most important problem to avian production system, being a potential vector of avian and other animal pathogens. The objective of this study was to evaluate the neem cake (Azadirachta indica) A. Juss (Meliaceae) as an alternative to control the Alphitobius diaperinus Panzer (Coleoptera: Tenebrionidae). The neem cake was directly applied to substrates at 100g m-2 and were evaluated the lethal and sublethal effects to A. diaperinus adults, as mortality, oviposition, repellent effect and feeding. There was no effect on adult mortality, but were observed reduction of the oviposition (23%), repellent effect, and reduction of insect feeding (21%).