Manuel Silva Valenzuela

Chili pepper is a vegetable of worldwide economic and gastronomic importance. The psyllid, Bactericera cockerelli, is an economically important pest in this crop, causing considerable losses in its production. Currently, the application of insecticides is the main way to control B. cockerelli. However, the use of varieties resistant to this insect is a viable alternative for its control and management. In this work, the oviposition rate, development, and survival of B. cockerelli in two native varieties of chili were evaluated. Choice and non-choice trials showed that the B. cockerelli oviposition was reduced on CJ-2018 by 92.17 and 80.18%, respectively, compared to the control. In CM-334, the insect showed a behavior similar to the control in the non-choice test, while in the choice test it laid more eggs on CM-334 compared to the control. The development and survival assay showed that only 1.33% of the eggs managed to reach the adult stage on CJ-2018. In contrast, on CM-334 the survival of B. cockerelli was similar to the control. These results suggest that CJ-2018 presented a resistance based on antixenosis and antibiosis against B. cockerelli.

The current article is divided in two parts. On a practical level, the interest of this research is to offer alternative solutions to the gaps in the regulatory framework of the Nicaraguan agricultural market, which pave the way for an unequal distribution of the economic resources generated by the national agricultural activity, in the agri-food supply chain. The objective was to determine the legal gaps that allow the unequal distribution of resources in the national agri-food supply chain and propose possible alternatives based on the agrarian doctrine. For this purpose, using analysis-synthesis, abstract-concrete, systemic-structural-functional and inductive-deductive analyses, the systems of marketing agricultural products in the countries of Central America and Nicaragua was examined and compared. As practice shows, small producers of food are not adequately protected and when it comes to commercial relationships their position is weak in the overall agri-food supply chain.