A decision support model for assisting smallholder farmers on bidding to supply to institutional markets

In Brazil, institutional markets emerged as an opportunity for family farmers to distribute their produce and secure and income. However, the lengthy bureaucratic process and relatively high cost associated to the bidding process for such markets determine the challenge faced by family farmers to decide which public calls to subscribe to in order to distribute their products to schools and public institutions through governmental programs as PAA and PNAE. This research proposes a Decision Support System (DSS) based on a mathematical model to help the farmers in the bid/no-bid decision. Based on the individual profitability of the products and the geographical area value concentration criterion, the DSS suggests to the farmers which bids to attend in order to obtain the expected highest profit if the bids are secured

In vitro co-cultures of Pinus pinaster with Bursaphelenchus xylophilus: a biotechnological approach to study pine wilt disease

Abstract Main conclusion Co-cultures of Pinus pinaster with Bursaphelenchus xylophilus were established as a biotechnological tool to evaluate the effect of nematotoxics addition in a host/parasite culture system. The pinewood nematode (PWN), Bursaphelenchus xylophilus, the causal agent of pine wilt disease (PWD), was detected for the first time in Europe in 1999 spreading throughout the pine forests in Portugal and recently in Spain. Plant in vitro cultures may be a useful experimental system to investigate the plant/nematode relationships in loco, thus avoiding the difficulties of field assays. In this study, Pinus pinaster in vitro cultures were established and compared to in vivo 1 year-old plantlets by analyzing shoot structure and volatiles production. In vitro co-cultures were established with the PWN and the effect of the phytoparasite on in vitro shoot structure, water content and volatiles production was evaluated. In vitro shoots showed similar structure and volatiles production to in vivo maritime pine plantlets. The first macroscopic symptoms of PWD were observed about 4 weeks after in vitro co-culture establishment. Nematode population in the culture medium increased and PWNs were detected in gaps of the callus tissue and in cavities developed from the degradation of cambial cells. In terms of volatiles main components, plantlets, P. pinaster cultures, and P. pinaster with B. xylophilus co-cultures were all b- and a-pinene rich. Cocultures may be an easy-to-handle biotechnological approach to study this pathology, envisioning the understanding of and finding ways to restrain this highly devastating nematode. Keywords Maritime pine ! Monoxenic culture ! Pinewood nematode ! Relative water content ! Shoots structure ! Volatiles Abbreviations BAP 6-Benzylaminopurine DAI Days after inoculation EPPO European and Mediterranean Plant Protectio