Banca de DEFESA: PATRICIA SANTOS DE CASTRO FERNANDEZ

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PATRICIA SANTOS DE CASTRO FERNANDEZ
DATE: 31/08/2020
TIME: 14:00
LOCAL: https://conferenciaweb.rnp.br/webconf/elen-de-lima-aguiar-menezes
TITLE:

Mites and insects associate with different varieties of hop in four municipalities of Rio de Janeiro states

KEY WORDS:

Humulus lupulus, phytophagous insect, phytophagous mite, predator insects, plant-insect interaction, tritrophic relationship.

PAGES: 133
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Entomologia Agrícola
SUMMARY:

The commercial cultivation of hops (Humulus lupulus L., Cannabaceae) is relatively new in Brazil when compared to countries in Europe, such as Germany, and North America (United States of America, mainly), which are the main hop producers and exporters of pelleted hop, whose main market is the beer sector. In Brazil, the importance of the female flower of this plant, called a cone and used in natural for the manufacture of craft beer, gained notoriety from crops in the south and southeast regions. In the state of Rio de Janeiro, the cultivation of hops has been gaining spaces in municipalities in the mountain region, particularly Nova Friburgo and Teresópolis, interested in meeting the internal demand of artisanal breweries. However, phytosanitary problems associated with this crop have already been detected by producers and technicians who assist them, but few technical-scientific records of arthropods as pests associated with this crop in Brazil have been found in the literature. However, key pest species of hops grown in other countries are known. These observations raised the need to answer the following technical-scientific questions: (1) is the phytophagous arthropodfauna associated with hops in Brazil the same as in other countries? And (2) is some species of phytophagous arthropod occurring in Brazil more commonly found in commercial hop crops? In this context, this study was developed with the following objectives: (1) to identify the species of phytophagous arthropodfauna (mites and insects) associated with the leaves of H. lupulus (hops), as well as possible predatory insects, in seedlings or adult plants in the municipalities from Cachoeiras de Macacu, Cordeiro, Nova Friburgo and Seropédica, RJ, and (2) evaluate the levels of infestation of the arthropod that most commonly infests the leaves of hop varieties in commercial plantations in Cordeiro and Nova Friburgo, and identify possible predatory insects. Phytosanitary inspections were carried out on hops plants, with the aid of a 20x magnifying glass, and once arthropods were detected, the infested leaves were collected for identification in the laboratory, where some insects collected in the immature phase were created to observe their development and obtain the adult for identification, and sometimes biological data. The results obtained during the study period (03/July/2019 to 21/January/2020) show that the hops serve as a host plant for phytophagous arthropods of the classes Arachnida (subclass Acari) and Insecta [orders Hemiptera (Aetalionidae and Aleyrodidae) and Lepidoptera (Noctuidae)], and that some of these phytophagous species are associated with predatory insects. The twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), considered a key pest in countries that traditionally grow hops, infests hop in Brazil, but its potential as a key pest of commercial hop plantations needs to be further investigated. The infestation levels of the twospotted spider mite were higher in Nova Friburgo than in Cordeiro. This phytophagous mite infested the five evaluated hop varieties (Brazylinsk, Cascade, Hallertau, Saaz and Victoria) in both locations, but there was no difference in their infestation levels among the varieties. The insect predators of the twospotted spider mite were the thrips of the genus Scolothrips Hinds [S. sexmaculatus (Pergande) and S. pallidus (Beach) (Thysanoptera: Thripidae)] and lady beetles of the genus Stethorus Weise (Coleoptera: Coccinellidae). Frankliniella gemina Bagnall (Thysanoptera: Thripidae) was another species of thrips identified, but has a phytophagous habit, being infrequent and occurring in a very small number. Hops are registered for the first time as a host plant for leafhopper, Aetalion reticulatum (Linnaeus) (Hemiptera: Aetalionidae) in Brazil, where it is associated with 74 plant species, distributed in 32 families. Thus, this result expands the host series of this leafhopper. The interaction of A. reticulatum aggregations with Trigona spinipes (Fabricius) (Hymenoptera: Apidae) was also observed. Trialeurodes vaporariorum (Westwood), which is a hop pest species in New Zealand, is recorded for the first time infesting hop leaves (Hallertau and Saaz varieties) in Brazil, but its potential as a pest has yet to be investigated. This is the first record of hops as a host plant for 14 other species of white flies from the subfamilies Aleurodicinae and Aleyrodinae distributed among nine inspected hops varieties (Brazylinsk, Cascade, Chinook, Columbus, Hallertau, Nugget, Saaz, Spalt and Victoria). Hops are also registered for the first time as a host plant for larvae of three species of Lepidoptera (Noctuidae, Noctuinae): Elaphria agrotina (Guenée), Spodoptera dolichos (Fabricius) and Spodoptera eridania (Stoll), which were able to feed on hops leaves, and the latter was preyed on by Ceraeochrysa cornuta larva (Navás) (Neuroptera: Chrysopidae) in field conditions. It is concluded that only Tetranychus urticae and Trialeurodes vaporariorum were the only phytophagous species of common occurrence in other countries associated with hops, the first being more frequently found in commercial hop plantations in Nova Friburgo and Cordeiro.

BANKING MEMBERS:
Presidente - 2223814 - ELEN DE LIMA AGUIAR MENEZES
Externo ao Programa - 2141321 - ANDRE LUIS SANTOS RESENDE
Externo à Instituição - WALTER JOSE RODRIGUES MATRANGOLO