Interaction of Rotylenchulus reniformis and Meloidogyne javanica with mealybug wilt of pineapple, in microplots

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• 作者：Thiago de Freitas Ferreira ; Ricardo Moreira Souza…
• 关键词：Reniform nematode ; Root ; knot nematode ; Dysmicoccus brevipes ; Pineapple mealybug wilt ; associated virus ; Ananas comosus
• 刊名：European Journal of Plant Pathology
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：141
• 期：4
• 页码：761-768
• 全文大小：530 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Pathology
  Plant Sciences
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-8469

文摘

Mealybug wilt of pineapple (MWP) is a disease complex whose etiology seems to involve the mealybug Dysmicoccus brevipes and pineapple mealybug wilt-associated virus-1, ? and/or ?. MWP, the reniform and the root-knot nematodes (RN, RKN) are major problems of pineapple crop worldwide. Although these nematodes are often found in MWP-affected plantations, so far, no study has investigated possible interactions among these pests causing symptoms and affecting the development of pineapple plants. Pineapple plantlets free of diseases and pests (Vitória cultivar) were inoculated with i) RN; ii) RKN; iii) viruliferous mealybugs; iv) RN and viruliferous mealybugs; and v) RKN and viruliferous mealybugs. Uninoculated plants served as controls. After inoculation, the plants were transplanted into microplots, where shoot symptoms and growth were assessed at 9 and 16?months after inoculation. RN, RKN and MWP induced distinct shoot symptoms, which appeared much worse in co-inoculated plants, including the collapse and death of nearly half of the experimental plants at 16?months. RKN, RN and MWP, alone or in combination, reduced the fresh weight of the root system up to 88?% and shoot weight up to 68?%. The interaction among these pests was additive. The results of this experiment emphasize the need for further studies conducted in commercial plantations to understand the interactions among RKN, RN and MWP, and their relative importance, since these are often misdiagnosed and consequently poorly managed.