Abstract
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.
Highlights
Cassava production plays an important socioeconomic role, with crops concentrated in areas belonging to small producers, that are characterized by the use of few inputs and low levels of technology
We evaluated one widely cultivated genotype in the South-Central region of Brazil (Santa Helena), two landrace genotypes widely studied for resistance to pests (MEcu 72 and Col 22) and two materials from the breeding cassava program of Embrapa Mandioca e Fruticultura (Clone 02 and Clone 33)
Eggs from females fed on MEcu72 showed the highest viability than eggs from females fed on other genotypes, being 27.5% higher compared to Clone 02 (Table 2)
Summary
Cassava production plays an important socioeconomic role, with crops concentrated in areas belonging to small producers, that are characterized by the use of few inputs and low levels of technology. In Southeastern Brazil, the cassava lace bugs Vatiga manihotae (Drake 1922) and V. illudens (Drake 1922) (Hemiptera: Tingidae) are important cassava pests and are worrying the productive sector of cassava due to the population increase and potential damage (Bellon et al, 2012; Pietrowski et al, 2010). These species of Vatiga have shown preference to feed on cassava and both nymphs and adults can cause damage to the plants (Bellotti et al, 2002).
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