Abstract:
A survey study and lab experiment was conducted in this study. The survey study was held
on four district. Three are coastal area viz. Noakhali, Barisal and Patuakhali and another is
in SAU campus in Dhaka. The lab experiment was conducted in Molecular Biology and
Plant Virology Laboratory, Department of Plant Pathology, Sher-e-Bangla Agricultural
University, during January 2018 to March 2019. The study was aimed to demonstrate
occurrence and incidence of basal stem rot and foliar diseases of coconut in surveyed area
and to develop a biocontrol-based management package against basal stem rot. The disease
incidence of basal stem rot was measured 65%, 64.44%, 60.83%, 49.17%, in SAU,
Patuakhali Noakhali and Barisal respectively. The disease severity was 33.88%, 30%,
26.67%, and 24.58% respectively in Noakhali, SAU, Patuakhali and Barisal. The incidence
of foliar diseases was estimated 85%, 85%, 78.61%, and 77.78% respectively in Noakhali,
SAU, Patuakhali and Barisal. The disease severity was 39.13%, 33.56%, 28.33% and
24.13% respectively in Noakhali, Patuakhali, SAU and Barisal. The highest incidence of
basal stem rot (27.5%) and leaf disease (19.2%) was found in loamy soil. The highest
disease incidence was found at the soil pH 6-7 and the incidence were 26.75% and 22.45
respectively. The highest incidence of basal stem rot (24%) and foliar diseases (18%) was
found in plant age group 36-40 years. In total 120 root samples and 90 leaf samples were
collected for aseptic isolation. The isolated pathogens from root samples were identified as
Ganoderma sp. while three pathogens were isolated from leaf samples which are Pestalotia
sp., Curvularia sp., and Alternaria sp. In total 32 Ganoderma infected plants from SAU
campus were selected and treated with 3 management package of different bioagent and
botanicals viz., Trichoderma viridae, cattle urine, masturd oil cake, neemseed extract and
garlic extract. After 5 months of treatment root samples were collected and investigated
for existence of pathogen .Among the three combinations mustard oil cake + neemseed
extract + Trichoderma viridae and cattle urine gave the best performance and disease
inhibition were 35% and 52.5% over control. The result of the present study revealed that
basal stem rot and foliar diseases are frequently occurred in the survey areas and cattle
urine was found effective in the management of this disease in coconut.
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
In partial fulfillment of the requirements for
the degree of
MASTER OF SCIENCE
IN
PLANT PATHOLOGY