Abstract
This work evaluated the attractiveness and the non-preference for feeding of newly hatched fall armyworm larvae on the cotton plant parts and different varieties used in the study. The trials were performed at 27 ± 1oC, a 70% ± 10% relative humidity and a 14h photoperiod. Leaves, bracts, squares and carpel walls of the BRS Itamarati-90 variety and leaves of Fibermax-966, Fibermax-977, DeltaOpal, DeltaPenta, BRS Acala-90, Coodetec-408, Coodetec-409, Coodetec-410, BRS-Cedro, BRS-Ipe, BRS- Aroeira, IPR-96, IPR-120, BRS-Araca, IAC-24 and BRS Itamarati-90 varieties were used in attractiveness, multiple-choice and confinement (no-choice) non-preference feeding trials. Twenty larvae were released per petri dish test (arena system) with 10 repetitions. Attractiveness trials were evaluated by counting feeding caterpillars over 60 min. and by measuring non-preference at 24h. Leaves were the most attractive item and were preferred for feeding. In the multiple-choice arena trials, Coodetec-410 was the most attractive variety, and BRS Acala-90, Fibermax-966 and DeltaPenta were the least attractive to fall armyworm larvae. In the non-preference trial, BRS-Araca was the variety favored for feeding. BRS-Cedro, BRS Itamarati-90, DeltaPenta, Coodetec-408 and BRS-Aroeira were the least-favored varieties. In the 60 min. attractiveness trials, 46 min. proved to be the most suitable time for evaluating the attractiveness of cotton plants to newly hatched fall armyworm larvae.
Highlights
IntroductionE. Smith), a native species of tropical and subtropical regions of the Americas, is geographically widespread (LUGINBILL, 1928) and feeds on a wide range of cultivated plants (LUGINBILL, 1928)
Fall armyworms were obtained from the National Maize and Sorghum Research Center (CNPMS – EMBRAPA) located in Sete Lagoas, Minas Gerais
The following varieties were utilized in this trial: Fibermax-966, Fibermax977, DeltaOpal, DeltaPenta, BRS Acala-90, Coodetec-408, Coodetec-409, Coodetec-410, BRSCedro, BRS-Ipê, BRS-Aroeira, IPR-96, IPR-120, BRS-Araçá, IAC-24 and BRS Itamarati 90
Summary
E. Smith), a native species of tropical and subtropical regions of the Americas, is geographically widespread (LUGINBILL, 1928) and feeds on a wide range of cultivated plants (LUGINBILL, 1928). Agronomy on plants of the grass family (maize, millet, wheat, sorghum, rice and sugar cane), it will attack other such economically important crops as peanuts, potato, soybean and cotton (ALI et al, 1989). The fall armyworm, considered one of the chief pests of maize in North America (WISEMAN et al, 1966), finds the climate of Brazil favorable and Maringá, v. 125-130, Apr.-June, 2012 encounters diverse food items in all regions and throughout the year (SANTOS, 2001; SOARES; VIEIRA, 1998; SILVA et al, 2009) The fall armyworm, considered one of the chief pests of maize in North America (WISEMAN et al, 1966), finds the climate of Brazil favorable and Maringá, v. 34, n. 2, p. 125-130, Apr.-June, 2012 encounters diverse food items in all regions and throughout the year (SANTOS, 2001; SOARES; VIEIRA, 1998; SILVA et al, 2009)
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