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Current Status of Cashew Leaf and Nut Blight Disease (Cryptosporiopsis spp.) and Screening of Elite Cashew Hybrids Developed in 1996 and 1998 against the Disease in Eastern and Southern Tanzania
Res. Plant Dis. 2018;24:265-275
Published online December 31, 2018
© 2018 The Korean Society of Plant Pathology.

Dadili Japhet Majune1,2*, Peter Albert Masawe2, and Ernest Rashid Mbega1

1School of Life Sciences and Bio-engineering the Nelson Mandela African Institution of Science and Technology (NM-AIST), P. O. Box 447, Arusha, Tanzania
2Naliendele Agricultural Research Institute, P. O. Box 509, Mtwara, Tanzania
*Tel: +255 766 262655 Fax: +255 272 970016 E-mail: majuned@nm-aist.ac.tz ORCID https://orcid.org/0000-0002-2335-5985
Received November 15, 2018; Revised November 21, 2018; Accepted November 21, 2018.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Cashew (Anacardium occidentale L.) is an export crop and source of income in Tanzania. However, its productivity is challenged by insect pests and diseases. Cashew Leaf and Nut Blight Disease (CLNBD) caused by Cryptosporipsis spp. has been cited as one of the most devastating diseases in Tanzania. Studies were conducted to investigate incidences and severities of CLNBD on cashew in farmers’ fields and elite cashew hybrids developed in 1996 and 1998 in eastern and southern zones of Tanzania. Furthermore, a screen house experiment was conducted to screen these hybrids against CLNBD at Naliendele Agricultural Research Institute (NARI), Mtwara, Tanzania. The results indicated significant differences (P<0.001) in CLNBD incidences and severities in cashew in farmers’ fields across Bagamoyo, Nachingwea and Mtwara districts. Further, there were significant differences (P<0.001) among hybrids in CLNBD severities in the screen house experiment. In ranking the elite cashew hybrids, 38 were tolerant and 14 were susceptible to CLNBD. This observation suggests that elite cashew hybrids developed in 1996 and 1998 are more tolerant to CLNBD compared to cashew found in farmers’ fields. These findings strongly suggest that the elite cashew hybrids can be recommended for commercial farming in Tanzania.
Keywords : Cashew, CLNBD, Fungal, Incidence, Severity


December 2018, 24 (4)