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Efficacy of Foliar Spray with Seven Fungicides and a Botanical to Control Scab (elsinoe Fawcettii) and Dieback (colletotrichum Gloeosporioides) Diseases of Lemon

T. A. Siddiquee
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka1207, Bangladesh

M. R. Islam
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka1207, Bangladesh

F. M. Aminuzzaman
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka1207, Bangladesh

A. N. Faruq
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka1207, Bangladesh

M. M. Islam
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka1207, Bangladesh

Abstract/ Executive Summary:

An investigation was conducted in a six year old lemon (Citrus limon) garden during March to September 2007 to find out the effect of foliar spray with seven fungicides and a botanical on the severity of citrus scab (Elsinoe fawcettii) and dieback (Colletotrichum gloeosporioides) of the crop. The tested fungicides were Dinthane M 45 (0.30%), Rovral 50 WP (0.10%), Bavistin 50 WP (0.10%), Champion 77 WP (0.20%), Cupravit 50 WP (0.20%), Tilt 250 EC (0.25%), Proud 250 EC (0.25%) and the botanical allamanda (Allamanda cathartica) leaf extract (1:4). The results showed that the fungicides and allamanda leaf extract are effective to achieve significant reduction in severity of scab and dieback diseases, and to increase fruit yield of lemon. The reduction of Percent Disease Index (PDI) of scab on leaf and fruit, and that of dieback ranged 26.45-83.87, 49.01-60.20 and 35.22- 58.01%, respectively after six months of first spray. The relationship of increase in fruit yield was directly and linearly correlated with percentage of reduction in severity of dieback diseases. Based on reduction of disease severity and increase of fruit yield, Allamanda leaf extract was noted as most effective material followed by Bavistin 50 WP, Tilt 250 EC, Cupravit 50 WP and Dithane M-45.

Keywords: Citrus, Scab, Dieback, Lemon, Fungicide, Botanical, Control

Location: Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka1207, Bangladesh

Start Date: 00-03-2007

End Date: 00-09-2007

Program Area: Pest Management

Commodity: Fungicide

Objectives:

To evaluate the efficacy of foliar spray with seven fungicides and a botanical to control scab and die-back of citrus.

Methodology:

The tested fungicides in the study were Rovral 50 WP (Iprodione) @ 0.1%, Champion 77 WP (Copper hydroxide) @ 0.2%, Dithane M 45 (Mancozeb) @ 0.3%, Cupravit 50 WP (Copper Oxychloride) @ 0.1%, Tilt 250 EC (Propiconazole) @ 0.25%, Proud 250 EC (Propiconazole) @ 0.25%, Bavistin 50 WP (Carbendazim) @ 0.1%, and the botanical allamanda (Allamanda catliartica) leaf extract @ 1:4 were used as treatments in the present study. Another treatment was maintained in the study where plain water was sprayed, which served as Control. Suspensions of all materials were prepared with water. The experiment was conducted in a well established lemon garden at Sher-e-Bangla Agricultural University campus, Dhaka during March to September, 2007 following complete randomized block design with three replications (plants). Twenty seven plants of 6 years old were selected from the garden, which were considered as experimental units. Before initiation of the experiment, weeding, irrigation, application of fertilizer, manure and insecticides were done. All treatments were applied as foliar spray for 6 times at an interval of 15 days starting from 15 May, 2007. Data on the incidence of both scab and dieback were recorded after 2, 4 and 6 sprays from 5 randomly selected twigs of each plant. First spray was done in 15 May, 2007. The plants were sprayed 7 times at 15 days intervals. Number of total as well as scab infected leaves and fruits of selected twigs, and number of dieback infected twigs were recorded. The incidence of scab on leaves and fruits, and that of dieback on twigs were expressed in percentage based of total number of observations. The severity of scab on leaf or fruit was recorded following a 0-5 scale, where 0=No infection, l=Less than 5%, 2=5-10%, 3=11-20%, 4=21-30% and 5= more than 30% areas of leaf or fruit are infected. The dieback severity was also recorded following a 0-5 scale as described by Rahman and Hossain (1988) with slight modifications, where 0=No infection, l=Up to 10%, 2=11-20%, 3=21- 30%, 4=31-50% and 5= more than 50% twigs are infected.The data on various parameters were analyzed and means of treatments were tested by Duncan's Multiple Range Tests (DMRT) using MSTAT-C package.

Source of Information: The Agriculturists 9 (1&2): 99-105 (2011) ISSN-1729-5211, A Scientific Journal of Krishi Foundation

Article Link (Online Journal): http://banglajol.info/index.php/AGRIC/article/view/9484/7029

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Bavistin 50 WP, Cupravit 50 WP, Champion 77 WP, Dithane M-45 and Allamanda leaf extract may be applied to control scab and dieback diseases and to increase fruit yield of lemon. However, before final recommendation further test is necessary for 3-4 consecutive years.

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