Plant extracts controlling the citrus mealybug, planococcus citri (risso, 1813) (Hemiptera: Pseudococcidae) in coffee plants [Extratos de plantas no controle de Planococcus citri (Risso, 1813) (Hemiptera: Pseudococcidae) em cafeeiro]
Santa-Cecilia L.V.C.,Ecocentro Cx P |
Santa-Cecilia F.V.,Federal University of Alfenas |
Pedroso E.C.,Engenheira Agronoma |
de Sousa M.V.,Ecocentro Cx P |
And 3 more authors.
Coffee Science | Year: 2010
The citrus mealybug, Planococcus citri (Risso, 1813), is a sap-sucking insect that attacks the rosettes of coffee plants (Coffea spp.), causing significant losses. Plant extracts with insecticidal activity are alternatives which can be incorporate into the Integrated Pest Management (IPM). Plant extracts, prepared from 186 plants collected in the state of Minas Gerais, were evaluated under laboratory conditions to control the citrus mealybug. The most efficient extract was selected for more accurated tests including methods of application, plant parts extraction and concentration. Among the 232 extracts studied, only those from avocado, Persea americana P. Mill., was selected, since it caused the greatest mortality of mealybug nymphs. The most efficient extract was prepared from the husk (coconut shell) of avocado, at 250 mg mL -1 in water. When applied with an atomizer, such extract caused 77.0% mortality of P. citri nymphs.
Neto M.P.,Federal University of Lavras |
Reis P.R.,Ecocentro Cx P |
Zacarias M.S.,Ecocentro Cx P |
Silva R.A.,Ecocentro Cx P
Coffee Science | Year: 2010
Climate changes, such as temperature rise, prolonged drought and heavy rainfall, impair human activities, especially the food production sector. Rainfall is one of the most important natural, life-sustaining factors on the planet and it is essential in agriculture, not only to water plants, but also in regulating pest organisms in crops through mechanical control. The mites Brevipalpus phoenicis (Geijskes, 1939) and Oligonychus ilicis (McGregor, 1917) (Acari: Tenuipalpidae, Tetranychidae) are important coffee pests influenced by the rainfall regime. The aim of this work was to study the distribution of coffee predatory (Phytoseiidae family) and phytophagous (B. phoenicis and O. ilicis) mites in function of rainfall, between June/2006 and June/2008, in organic and conventional coffee cultivation systems. The experiments were conducted at Cachoeira (organic coffee production) and Taquaril (conventional system) farms, located in the municipality of Santo Antonio do Amparo, Minas Gerais state, in Brazil. Leaves were removed monthly from the middle part of coffee plants from both systems. It was concluded that rainfall influences the populations of pest and predatory mites in the different coffee production systems, but this effect was less intense in the organic coffee.