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Perdas causadas por Coccus viridis (Hemiptera: Coccidae) em mudas de Coffea arabica L.

Flávio Lemes Fernandes,M. C. Picanço,Maria Elisa de Sena Fernandes,Tarcísio Visintim da Silva Galdino,Adriano Cirino Tomaz

Published 2009 in Unknown venue

ABSTRACT

Coccus viridis (Green) danifica plantas jovens e adultas de Coffea arabica Linnaeu. No entanto, nada se sabe sobre a magnitude dos danos causados por esta praga. Assim, este trabalho teve por objetivo estudar as relacoes entre o ataque de C. viridis e as perdas causadas por este inseto a C. arabica . Este trabalho foi conduzido em casa de vegetacao na Universidade Federal de Vicosa. Foram utilizadas sementes da linhagem IAC 15 da variedade “Catuai vermelho” de cafe ( C. arabica ). Para a confeccao dos tratamentos esta praga foi criada em casa de vegetacao separada do experimento. Os tratamentos foram: plantas infestadas e nao infestadas por adultos e ninfas da cochonilha verde. As plantas foram nutridas com solucao nutritiva. Durante 110 dias foram avaliados: numeros de adultos e de ninfas de primeiro, segundo e terceiro instares, area foliar, diâmetro do caule, altura das plantas em todas repeticoes. No final do experimento avaliou-se o peso das raizes, caule, folhas e total. Os pesos das raizes, materia seca total, area foliar e diâmetro do caule de plantas nao atacadas por C. viridis superaram em 1,31; 1,41; 1,50 e 8,93 vezes, respectivamente o peso de plantas atacadas. As variaveis selecionadas foram: diâmetro do caule (cm), area foliar (cm²), peso de raizes (g), ninfas, adultos e total das cochonilhas. Concluindo que a planta de C. arabica e afetada de forma diferente entre seus orgaos e que a ninfa de terceiro instar e adultos sao as fases que mais causam danos a C. arabica . Losses Caused by Coccus viridis (Green) (Hemiptera: Coccidae) on Seedlings of Coffea arabica L. Abstract. Coccus viridis (Green) cause losses on seedling and old plants of Coffea arabica (Green). However, nothing is known about of the damages caused by this pest. Thus, the objective of this work was to evaluate the relations between atack of C. viridis and the losses caused by this insect. on C. arabica . This work was conduced in greenhouse at Federal University of Vicosa. Seed coffee plants line IAC 15, variety “Catuai vermelho” ( C. arabica ) were used. The insects were reared into greenhouse and separated of the experiment. The treatments were: infested plants and no infested by adults and nymphs of the green scale. The plants were nourished with compound nutrient solutions. For 110 days evaluated: numbers of adults and nymphs of instar first, second and third, leaf area, diameter of stem and plant height in all repetition. At the end of the experiment were evaluated weights of root, stem, leave and total. The weight of root, total dry matter, leaf area and diameter of the stem at plants no attacked by C. viridis were 1.31, 1.41, 1.50 and 8.93 times more than weight attacked plants, respectively. The main variables were: diameter of the stem (cm), leaf area (cm²), weights of root (g), nymphs, adults and all cochineals. Also, parts of the plant ( C. arabica ) were damaged by nymphs (third) and adults of C. viridis .

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