Banca de QUALIFICAÇÃO: GUILHERME VELOSO DA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : GUILHERME VELOSO DA SILVA
DATE: 22/03/2024
TIME: 09:00
LOCAL: CECA
TITLE:

FAUNA MITE ASSOCIATED WITH PINEAPPLE CULTURE, RECOGNITION AND CONTROL TACTICS

KEY WORDS:

Bromeliaceae, Ananas comosus, Biological control, Cosmolaelaps

PAGES: 77
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

Pineapple cultivation represents an economically relevant activity in several Brazilian states. However, this crop is attacked by various pest species, resulting in considerable damage and consequent losses. Despite this, there is a lack of detailed studies on the faunistic composition of one of the main pests, which are the mites associated with this crop, as well as effective pest control strategies, mainly directed at the Florida red mite (Dolichotetranychus floridanus). This study aims to recognize the fauna mite associated with pineapple cultivation, as well as specific control strategies aimed at mitigating the economic losses associated with the presence of D. floridanus in the crop. For chemical control, a randomized block design was employed, with five treatments and four repetitions to conduct the experiment. The tested products were: Abamectin®, Orthene®, Lorsban®, Pirate®, and water (used as control). Each product was applied at the following dosages: 50mL/50L, 50g/L, 75mL/50L, and 50mL/50L, respectively. After the application of the products, four laboratory evaluations were carried out over the period of 2, 4, 8, and 16 days. In these evaluations, the mites of the species D. floridanus were identified and quantified according to the number of colonies formed, observing the injuries that caused chlorosis/necrosis, and were subsequently properly identified. It was found that Lorsban® and Pirate® had a greater effectiveness in reducing populations of D. floridanus, in seedlings with chlorosis, with Lorsban® standing out, enabling 100% mortality of the mites on the second day of evaluation. After the eight-day evaluation period, an increase in the number of live mites was observed in colonies treated with Orthene® and Pirate®. For biological control, colonies of mites of the genus Cosmolaelaps were established in plastic containers measuring 7 cm in height by 11 cm in diameter. The substrate consisted of a 0.5 cm layer of a mixture of gypsum and activated charcoal in a ratio of 9:1. Moisture was maintained with a source of phytonematodes and daily addition of distilled water. The experimental units were plastic Petri dishes (2 cm in height x 3 cm in diameter), with the base covered by a 0.5 cm layer of the same mixture of gypsum and activated charcoal. In each experimental unit, 1 female of the genus Cosmolaelaps was placed for every 40 prey (D. floridanus). Predatory capacity was evaluated at different periods: 24, 48, 72, and 96 hours. The data were subjected to analysis of variance using regression testing. Regarding the predatory capacity of the Cosmolaelaps sp. mite in controlling D. floridanus over 24 hours, it was observed that adult females of Cosmolaelaps sp. consumed 92% of D. floridanus, indicating prey acceptance. The low predation percentage is attributed to high consumption in previous periods. At 72 hours, eggs were observed in the arenas. The insecticide-acaricide Lorsban® was the most effective in controlling D. floridanus. Considering the high prey acceptance, the mite of the genus Cosmolaelaps sp. proved to be a promising biological control agent.

COMMITTEE MEMBERS:
Presidente - 1642163 - EDMILSON SANTOS SILVA
Interno(a) - 2337920 - ROSEANE CRISTINA PREDES TRINDADE
Externo(a) à Instituição - JANDIR CRUZ SANTOS