(DOWNLOAD) "Loss Assessment in Some Important Forest Tree Species, Caused by Eutetranychus Orientalis (Klein) (Acarina: Tetranychidae)." by Bulletin of Pure & Applied Sciences-Zoology * Book PDF Kindle ePub Free
eBook details
- Title: Loss Assessment in Some Important Forest Tree Species, Caused by Eutetranychus Orientalis (Klein) (Acarina: Tetranychidae).
- Author : Bulletin of Pure & Applied Sciences-Zoology
- Release Date : January 01, 2006
- Genre: Engineering,Books,Professional & Technical,
- Pages : * pages
- Size : 196 KB
Description
INTRODUCTION Eutetranychus orientalis (Klein), commonly known as Oriental red mite; has been reported as serious pest of orchards, agricultural crops, cash crops, medicinal plants as well as forest tree species (Sadana & Kanta 1972; Dhooria 1982; Shah et al. 1986; Gupta1985; Gupta & Gupta 1994).Yousuf & Chouhan (1996) reported severe incidence and new host-record of E. orientalis from Rajasthan, India. Despite heavy infestation on Azadirachta indica with considerable defoliation, other forest tree species: Ailanthus excelsa, Albizia lebbeck, Bauhinia purpura, Cassia siamia, Moringa oliefera and Pogamia pinnata were also recorded as important host plants of E. orientalis. Sharma & Naqvi (1991) tested a number of chemical miticides for controlling E. orientalis on Zizyphus mauritiana, and concluded that Ethion 0.05 % was proved most effective. During the course of regular survey (Chouhan & Yousuf, 1996, 1997 and Yousuf & Chouhan 1996; 1998 ), it was recorded that out of several hosts from forest tree species, only five: Azadirachta indica, Albizia lebbeck, Moringa oleifera, Ailanthus excelsa and Zizyphus jujuba are severely infested by E. orientalis. All stages of mite suck cell-sap from leaves, tender shoots & fruits of host plants. Infested leaves are turned yellowish brown, dried up and ultimately fallen off. Mite infestation is usually seen on upper surface of leaves, under heavy webs to which dust particles are adhered. The infested leaves also get crumpled. Web formation, adhered dust particles and continuous cell sap sucking; affect badly photosynthesis and normal plant physiology. Hence the growth of host plant is retarded and vigour is reduced. Though the ample literature is available on infestation of Tetranychid mites on agricultural crops, commercial cash crops, fruit yielding and other tree species, but very little work could be done on loss assessment. Singh (1988) worked out, the assessment of losses to Soybean by red spider mite: Tetranychus telarius in Madhya Pradesh. During the course of present study, observations were taken on the losses, caused by infestation of E. orientalis. One year data were analyzed with T test and their significance has been discussed.
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