Association of peanut cultivars and aqueous neem extract in the feeding and development of Spodoptera frugiperda (J. E. Smith)

• Published in: EntomoBrasilis Vol. 13; p. e909
• Main Authors: Boiça Junior, Arlindo Leal, Rodrigues, Nara Elisa Lobato, Janini, Julio Cesar, Bottega, Daline Benites, Sousa, Vitor Quintela, Silva, Anderson Gonçalves da
• Format: Journal Article
• Language: English
• Published: Entomologistas do Brasil 30-09-2020
• Subjects: Arachis hypogaea; Azadirachta indica; insecticide plant; limonoid; resistance
• ISSN: 1983-0572; 1983-0572
• DOI: 10.12741/ebrasilis.v13.e909

The current study aimed to test how aqueous neem Azadirachta indica A. Juss. extract affects the attractiveness, feeding and development of Spodoptera frugiperda (J. E. Smith) on different: peanut cultivars. Tests were carried out under laboratory conditions with the cultivars IAC 503 and IAC 147 and aqueous neem extract in concentrations (mass/volume) of 5 and 10%, obtained from seeds and dried in an oven at a temperature of 35 to 38 °C for 15 days, with caterpillars offered a food choice preference test. For this, leaf discs from each treatment were placed in Petri dishes into which three first instar caterpillars were released. To assess resistance biology, single newly-hatched caterpillars were transferred to individual Petri dishes, where the following biological parameters were measured: larval mortality after 1, 3, 5, 7 and 10 days; pupal mortality; total mortality; weight of 10-day-old caterpillars; pupal weight at 24 hours; and adult longevity. The main conclusions of the work, include: cultivar IAC 147 was less attractive and consumed less; cultivar IAC 503 plus 10% neem extract reduced leaf consumption; cultivar type did not affect caterpillar biological development, and 10% neem extract caused 100% mortality in S. frugiperda.