Fall armyworm, Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) is one of the main pests in maize crop with developing resistance to chemical products and Bt technology. Therefore, alternative control methods such as essential oils are important steps in the implementation management strategies for this pest. This study aimed to evaluate the efficiency of essential oils (EOs) of Corymbia citriodora, Myrciaria dubia (Myrtaceae), Lippia microphylla (Verbenaceae) and Piper umbelattum (Piperaceae) in controlling S. frugiperda. The OEs were extracted and mortality tests were conducted with topic and volatile applications, in 30 second-instar caterpillars originated from insect rearing and artificial diet. As a control, we conducted tests with distilled water and acetone. EOs that provided mortality rates above 80% were submitted to chemical analysis for constituent identification. The efficient EOs were only those of C. citriodora and L. microphylla. For EO of C. citriodora, the LD80 was 7.06 ± 0.73 mg.g -1 in topical application and 5.85 ± 0.75 μL via volatile application. On the other hand, for EO of L. microphylla, DL80 was 9.95 ± 1.25 mg.g -1 in topical application and 18.56 ± 3.55 μL via volatile application. Chemical analysis showed that the main constituents were citronella for the EO of C. citriodora and (E)-caryophyllene and (E)-nerolidol to the EO of L. microphylla. EOs of C. citriodora and L. microphylla are promising for controlling S. frugiperda, with emphasis on the volatile effect of C. citriodora oil.

Objetivou-se avaliar a atividade acaricida potencial in vitro de extrato desenvolvido a base de sementes de Myrciaria dubia (caçari) em diferentes concentrações 1, 2, 4 e 8% de extrato hidroálcoolglicólico sobre o ácaro-vermelho-das-palmeiras, Raoiella indica Hirst (Tenuipalpidae), em cinco (05) repetições que consistiram de arenas formadas de um pedaço de folíolos de palmeira de manila (Adonidia merrillii), de 4x4 cm, com 10 fêmeas adultas de R. indica em cada arena.Os extratos apresentaram atividade acaricida potencial nos tratamentos relacionados as doses 4 e 8 % com valores médios brutos de mortalidade superiores a 82 % nos intervalos de 48 e 72 h.

The Hindustan citrus mite, Schizotetranychus hindustanicus Hirst (Acari: Tetranychidae), is a quarantine pest present in the state of Roraima, Brazil. This mite, which was described in India in 1924, was reported in 2002 in Venezuela and spread to Roraima, where it was reported in 2008, and to Colombia, where it was reported in 2010. Its possible spread to other regions of Brazil is a threat to Brazilian citriculture. This study reports the current distribution of S. hindustanicus and potential predators of this pest and other mites associated with citrus in Roraima. A survey was conducted in August and September 2015 in the 15 municipalities of the state. In each municipality, orchards and citrus plants in backyards and public areas along highways and in urban areas were sampled. Samples of leaves and fruits were collected to identify the mite and its natural enemies. Schizotetranychus hindustanicus was found in all 15 municipalities in the state of Roraima. In total, 308 associated mites were found, with S. hindustanicus being the most abundant phytophagous mite, followed by Brevipalpus yothersi Baker. Amblyseius aerialis (Muma) was the most abundant predator, followed by Iphiseiodes zuluagai Denmark and Muma and Euseius concordis (Chant). The broad dispersal of S. hindustanicus in Roraima increases the risks of this pest reaching the main citrus-producing regions in Brazil.

Caracterização molecular e morfológica de ácaros predadores da família Laelapidae (Acari: Mesostigmata) nos diferentes biomas brasileiros / Rosely Souza Pereira. --versão revisada de acordo com a resolução CoPGr 6018 de 2011. --Piracicaba, 2021. 65 p. Dissertação (Mestrado) -USP / Escola Superior de Agricultura "Luiz de Queiroz". 1. Ácaros predadores 2. Diversidade 3. Marcadores moleculares 4. COI 5. NUMTs I. Título