Identification of Insects in Crotalaria spp. in an Urban Experimental Area at Brasília, Brazil

Kleyson A. de Freitas, Rai S. Lemos and Marcelo T. de Castro

Journal of Agricultural Science, 2025, vol. 17, issue 2, 30

Abstract: Plants of the Crotalaria genus are of great importance, for example- they stand out as green manure. This work aimed to verify the occurrence of insects in C. juncea, C. spectabilis and C. ochroleuca. The experiment was performed out in an urban experimental area at Faculdade ICESP de Brasília, Águas Claras unit, Distrito Federal, Brazil, from March to June 2018. The experiment was installed in a randomized block design with nine experimental units of 1 m2. Three beds were divided into three experimental units for 1 m2, 50 seeds were planting at a spacing of 10 cm between rows and 10 cm between plants. The plants were evaluated weekly, where all insects were collected, counted and stored in glass jars with 70% alcohol. Plants were analyzed for attack and mortality was recorded for 11 weeks. The data were submitted to ANOVA and the Tukey test (α ≤ 0.05) using the R program. As a result, 767 insects from five orders and 10 different families were collected in the three species of Crotalaria used in this study, C. juncea was the species that attracted the most insects (415) and C. spectabilis presented the lowest number (126). Diabrotica speciosa caused great damage to species studied, especially C. juncea, and could become a harmful insect of importance for culture. Additionally, U. ornatrix was found in all three species, but in greater numbers in C. juncea and C. spectabilis.

Date: 2025
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