Banca de DEFESA: LUCIVANIA GOMES DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCIVANIA GOMES DA SILVA
DATE: 16/05/2022
TIME: 15:00
LOCAL: PLATAFORMA VIRTUAL GOOGLE MEET
TITLE:

COTTON BIOLOGICAL NUTRITION AS A PROTECTION TO THEPEST INSECT ATTACK AND CONSERVATION OF THEIR NATURAL ENEMIES.

KEY WORDS:

Anthonomus grandis; Azospirillum brasilense; Beauveria bassiana; biochar; insect monitoring; trophobiosis theory.

PAGES: 84
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

The Northeast was one of the three largest cotton producing regions in Brazil, but the occurrence of the long drought of 1979-1983, scrapping of technical assistance and rural extension, and the occurrence of the cotton boll weevil, Anthonomus grandis, in plantations, added the opening of imports in the early 1990s, took the culture into a deep crisis. Initiatives have been developed to reintroduce cotton cultivation in the Brazilian semi-arid region, especially with regard to the management of the boll weevil. The use of insecticides emerged as a solution for pest control and gained strength through the discourse of efficiency with speed and practicality, becoming a widely adhered practice in agriculture, however studies were noting its harm, although not enough to reduce uses, show the need to seek really effective solutions, capable of reaching the farmer and thus contributing to ensuring agricultural productivity by reducing negative externalities. The theory of trophobiosis, based on organic farming, argues 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, we sought to evaluate the use of organic farming techniques in cotton as a way of protecting against insect pests. To this end, three experiments were carried out at the Embrapa Experimental Station in Barbalha-CE between the period 2019 to 2020, under different cultivation conditions: irrigated, rainfed and greenhouse systems. The nitrogen-fixing bacterium 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 infestation of insect pests in the field and emergence of A. grandis in the field, as well as in the laboratory. The data obtained were submitted to analysis of variance and, when significant, the means were compared using the Scott-knott test. In the irrigated system, the presence of the insect pest A. gossyipii was identified, concluding that it was influenced by the phenological period of the crop and its natural enemies, but not by the sources of nutrition. In the rainfed area, identifying the presence of A. grandis, it was noticed that the treatments Azospirillum brasilense and Beauveria bassiana reduced the incidence of A. grandis. Under greenhouse conditions, it was found that BRS Araçá cotton plants treated with the bacterium Azospirillum brasilense had a lower occurrence of Anthonomus grandis oviposition. Studies of technologies that seek possibilities of viable agricultural production combined with environmental and social principles are essential for sustainable agriculture.

BANKING MEMBERS:
Externo à Instituição - Walter Santos Evangelista Júnior
Interno - 1513585 - FRANCISCO JOSE DE PAULA FILHO
Presidente - 1548701 - FRANCISCO ROBERTO DE AZEVEDO
Externo à Instituição - FÁBIO AQUINO DE ALBUQUERQUE