Adaptability and Comparative Biology of Fall Armyworm on Maize and Perennial Forage Species and Relation with Chemical-B
- PDF / 534,250 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 29 Downloads / 164 Views
PEST MANAGEMENT
Adaptability and Comparative Biology of Fall Armyworm on Maize and Perennial Forage Species and Relation with Chemical-Bromatological Composition LP RIBEIRO1, ALS KLOCK1, CN NESI1, FRG LUCZKIEVICZ2, MRL TRAVI2, AF RECH3 1
Research Center for Family Agriculture, Research and Rural Extension Company of Santa Catarina (CEPAF/EPAGRI), Chapecó, Santa Catarina State, Brasil 2 Uceff Univ., Chapecó, Santa Catarina State, Brasil 3 Lages Experimental Station (EPAGRI/EELages), Research and Rural Extension Company of Santa Catarina, Lages, Santa Catarina State, Brasil
Keywords Spodoptera frugiperda, Cynodon dactylon, Axonopus catharinensis, Arachis pintoi, host plant resistance Correspondence L.P. Ribeiro, Research Center for Family Agriculture, Research and Rural Extension Company of Santa Catarina (CEPAF/ EPAGRI), Rua Servidão Ferdinando Ricieri Tusset S/N - Bairro São Cristóvão, CEP 89803-904, Chapecó, Santa Catarina State, Brasil; [email protected] Edited by Silvana P Moraes – Univ of Florida Received 4 May 2020 and accepted 4 June 2020 * Sociedade Entomológica do Brasil 2020
Abstract This study compared the development of fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), on forage species of different genera (Arachis, Axonopus, and Cynodon) in relation to maize (preferred host) as well as its adaptability on these forage species, which are the main cultivated forages in southern Brazil. The biological performance of S. frugiperda fed on host plants studied showed the highest adaptation index (AI) in maize (26.89), followed by bermudagrass (22.02), suggesting that bermudagrass is the most suitable alternative host for the development of S. frugiperda. In contrast, the giant missionary grass (18.80) and Pinto peanut (13.81) showed lower adequacy, with a relative adaptation index (RAI) 69.93 and 51.35%, respectively, using maize as standard. The cluster analysis based on similarity of the chemical-bromatological parameters showed that maize has a richer composition than the other plant species studied. The multivariate correlation analysis between AI and chemicalbromatological composition showed a positive correlation between AI and contents of ashes, ethereal extract, potassium, phosphorus, and magnesium and, to a lesser extent, with contents of nitrogen, crude protein, and copper. In this context, complexity of host composition and balance between components could explain the biological fitness of S. frugiperda on host plant species. Pasture diversification with giant missionary grass, or especially with Pinto peanut, may be an interesting strategy for integrated pest management of fall armyworm in pasturelands in a regional context.
Introduction Caterpillars (Lepidoptera) are potential pests of pastures capable of consuming rapidly large productive areas worldwide (Auad et al 2016). Despite their seasonal occurrence, caterpillars exhibit great voracity, especially for their ability to scrape and consume leaves, reducing forage availability and pasture support c
Data Loading...
