Banca de DEFESA: ISABEL LOPES DE MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ISABEL LOPES DE MEDEIROS
DATE: 26/02/2025
TIME: 13:30
LOCAL: Universidade Federal do Agreste de Pernambuco
TITLE:

Sofhora flavencens: New Tool for Management of Hyadaphis foeniculi Passerini (Hemiptera: Aphididae) and Predator Selectivity Euborellia annulipes (Lucas) (Dermaptera: Anisolabididae)

KEY WORDS:

Fennel aphid; biological control; sustainability; dermaptera; bioinsecticides.

PAGES: 50
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUMMARY:

Brazil is one of the world's largest producers of vegetables, with an estimated annual production of over 20 million tons, generating around 7 million jobs. Fennel (Foeniculum vulgare), originally from the Mediterranean, stands out for its medicinal and aromatic properties. However, the expansion of this vegetable crop faces challenges, such as attacks by insect pests, especially aphids

of the Aphididae family, especially Hyadaphis foeniculi, which compromise the production of fruits and seeds of this crop. These insects cause direct damage, by sucking sap, and indirect damage, by transmitting viruses and promoting the growth of fungi. Losses can reach up to 60%, with chemical control being the main strategy. However, the indiscriminate use of pesticides generates environmental impacts and pest resistance, demanding more sustainable management practices. Thus, the study aimed to evaluate the efficacy of different bioinsecticides in controlling the aphid H. foeniculi and their selectivity in relation to the natural predator Euborellia annulipes. The extract of Sophora flavescens (Matrine®), the emulsifiable oil of Azadirachta indica (Fitoneem®) and the adjuvants (Ranger® and Santara®), based on essential oil from the peel of Citrus sinensis, were tested. The experiment was conducted under laboratory conditions, where the mortality rates of the aphids, survival curves and the toxicological effects and computerized behavioral ecology on the predator were analyzed. The results indicated that Matrine® provided the greatest efficacy, with a median lethal concentration (LC50) of only 609 ppm and a median lethal time (MLT) of 18 hours at a concentration of 10,000 ppm. Santara® also demonstrated good performance, with a LC50of 2008 ppm, while treatments with Ranger® and Fitoneem® showed low toxicity, with LC50above 10,000 ppm. There was an additive effect of the combination of Santara® and Matrine® on the mortality of H. foeniculi, since the observed mortality was higher than the expected mortality of 50% from the isolated effect of each of the products. The opposite was observed in E. annulipes, since the adjuvant Santara®, when mixed, nullified the slightly harmful effect of Matrine®. There is no evidence of significant impact of the products alone or in mixture on the ethological variables evaluated, i.e., average speed, resting period and continuous mobility. Thus, the S. flavencens extract with Matrine® alone or in mixture with the Santara® adjuvant stands out not only for its high toxicity to H. foeniculi, but also for its selectivity to E. annulipes, showing low impact on the predator compared to the other products.

COMMITTEE MEMBERS:
Externo à Instituição - JEAN PIERRE CORDEIRO RAMOS
Externo à Instituição - JACINTO DE LUNA BATISTA
Presidente - CESAR AUGUSTE BADJI
Externo à Instituição - JOAO PAULO RAMOS DE MELO