Banca de QUALIFICAÇÃO: LUCIVANIA GOMES DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUCIVANIA GOMES DA SILVA
DATA : 30/07/2021
HORA: 10:00
LOCAL: PLATAFORMA GOOGLE MEET
TÍTULO:

Cotton nutrition as protection against pest insect attack

PALAVRAS-CHAVES:

Anthonomus grandis; Azospirillum brasilense; Hawaiian Beauveria; Biochar; insect monitoring; trophobiosis theory.

PÁGINAS: 68
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The Northeast was one of the three largest cotton producing regions in Brazil, but the occurrence of the long drought of 1979-1983, the scrapping of technical assistance and rural extension, and the occurrence of the cotton boll weevil, Anthonomus grandis, in the plantations, combined the opening of imports in the early 1990s, brought culture into a deep crisis. Initiatives have been developed to reintroduce cotton cultivation in the Brazilian semiarid region, especially with regard to boll weevil management. The use of insecticides emerged as a solution for pest control and gained strength by the discourse of efficiency with speed and practicality, becoming a practice widely adhered to in agriculture, however studies have found its harmful effects, although not enough to reduce the uses, show the need to seek really effective solutions, capable of reaching the farmer and thus contributing to guaranteeing agricultural productivity without generating so many negative externalities. The theory of trophobiosis, based on organic agriculture, supports that a nutritionally unbalanced plant will be more susceptible to attack by pests and chemical products such as pesticides tend to promote this imbalance. Based on this premise, an attempt was made to evaluate the use of organic farming techniques in cotton, as a way of protecting against insect pests. For that, three experiments were carried out at the Experimental Station of Embrapa in Barbalha-CE between 2019 and 2020, in different cultivation conditions: irrigated, rainfed and greenhouse systems. The nitrogen-fixing bacteria Azospirillum brasilense, the fungus Beauveria bassiana and biochar in cotton were evaluated, analyzing the ability of these agents to improve crop nutrition, to express resistance to insect pests. The variables used as indicators were boll weevil infestation in the field and the emergence of boll weevils in the field, as well as in the laboratory. The data obtained were subjected to analysis of variance and, when significant, the means were compared using the Scott-knott test. In the irrigated system A. gossyipii was influenced by the phenological period of the crop and its natural enemies and not by the sources of nutrition. In the rainfed, the treatments that reduced the incidence of A. grandis were the bacterium Azospirillum brasilense and the fungus Beauveria bassiana. Studies of technologies that seek possibilities for viable agricultural production combined with environmental and social principles are essential for sustainable agriculture.

MEMBROS DA BANCA:
Externo ao Programa - 053.639.654-02 - FRANCISCO DE OLIVEIRA MESQUITA - UFERSA
Interno - 1513585 - FRANCISCO JOSE DE PAULA FILHO
Presidente - 1548701 - FRANCISCO ROBERTO DE AZEVEDO