Post-harvest evaluation of selected inbred lines to maize weevil Sitophilus zeamais resistance

Abstract

Maize weevil (Sitophilus zeamais Motschulsky) is a major maize (Zea mays L.) storage insect pest in the tropics which reduces the quantity and quality of maize hence facilitating establishment of aflatoxin and other mycotoxins. The objective of this study was to evaluate maize weevil resistance on selected inbred lines. Twenty eight inbred lines with 2 checks (MTPO701-reistant and Duma 41-susceptible) were used in this experiment. Thirty unsexed adult insects were introduced into 250 ml glass jars with grains of the lines at room temperature. Evaluation of weevil damage was done at 10, 60 and 120 days after maize weevil infestation. Each category of storage period was replicated 4 times and experiment was set at the same time. Data was collected on percent weevil damage, grain weight loss and number of live and dead weevils on each inbred line. ANOVA analysis showed significant differences (P ≤ 0.05) on weight loss. The selection of the resistant genotypes was based on percent weight loss after 60 days. Resistant lines selected included KEN2/TZL2.25# and LEPOOL-1/TZL2-2-1. These lines showed resistance to maize weevil damage and hence can be stored up to 4 months. At 120 days there was maximum damage and most lines could not be differentiated on the basis of resistance. KEN2/TZL2-2-5# showed consistency in resistance to maize weevils at all storage periods. High heritability at 60 days showed that selection for weevil resistance in these inbred lines is effective and feasible. Results in this study also revealed high, positive and significant correlation relationship between percent damage, weight loss and live weevils. The maize weevil resistant lines can be used to improve resistance of high yielding varieties in breeding programmes.

Resistência de genótipos de milho a densidades de Sitophilus zeamais (Coleoptera: Curculionidae)

“…Esses mecanismos podem ainda atuar de maneira sinérgica ou aditiva (BASTOS et al, 2015). Vários fatores condicionam a resistência de grãos de milho ao S. zeamais, como a dureza dos grãos, compostos fenólicos, enzimas inibidoras, teor de proteína e amido, coloração entre outros (NHAMUCHO et al, 2017;VI et al, 2017;KHAKATA et al, 2018).…”

Susceptibilidad de poblaciones nativas de maíz y preferencia del gorgojo en Yucatán, México

“…De acuerdo con García- Lara et al (2004) De acuerdo con Khakata et al (2018) existe la posibilidad de seleccionar materiales para mejoramiento genético con base en su respuesta de pérdida de peso ocasionada por el ataque se Sitophilus. Por otro lado, se reporta que los materiales nativos son las mejores fuentes para el mejoramiento genético para resistencia a Sitophilus, ya que las pérdidas que llegan a registrarse se encuentran por debajo de los registros de los materiales híbridos (Maggioni et al, 2016).…”

Alternative method of maize grain quality maintenance for small farmers through hermetic storage

“…Regarding corn storage in tropical and subtropical countries including Brazil, Sitophilus zeamais Mots., 1855 (Coleoptera: Curculionidae) is an important pest (Kaguchia et al 2018;Baoua et al 2014). It can reduce the nutritional value, germination percentage, weight, and commercialization of the grains (Frazão et al 2018;Khakata et al 2018).…”