Toxicity of black nightshade (Solanum nigrum) extracts on Alternaria brassicicola, causal agent of black leaf spot of Chinese cabbage (Brassica pekinensis)

2006 ◽  
Vol 154 (1) ◽  
pp. 45-50 ◽  
Author(s):  
M. Muto ◽  
V. Mulabagal ◽  
H.-C. Huang ◽  
H. Takahashi ◽  
H.-S. Tsay ◽  
...  
Keyword(s):  
Chinese Cabbage ◽  
Leaf Spot ◽  
Solanum Nigrum ◽  
Causal Agent ◽  
Alternaria Brassicicola ◽  
Black Nightshade ◽  
Black Leaf Spot ◽  
Brassica Pekinensis

scholarly journals Validation of Inoculation test and Screening for Resistance Sources of Mustard-Rapeseed Cultivars in Bangladesh Against Alternaria brassicicola

2018 ◽  
Vol 6 (1) ◽  
pp. 08-19
Author(s):  
Muhammed Ali Hossain ◽  
Ahsan Habib ◽  
Mohammad Shafiqul Islam ◽  
Fatema Tuz - Zohura ◽  
Md. Atiqur Rahman Khokon
Keyword(s):  
Leaf Spot ◽  
Large Scale ◽  
Alternaria Brassicicola ◽  
Border Line ◽  
Inoculation Methods ◽  
Detached Leaf ◽  
Brassica Spp ◽  
Seedling Inoculation ◽  
Black Leaf Spot ◽  
Line Resistance

Alternaria leaf spot or black leaf spot caused by Alternaria brassicicola is the devastating diseases of mustard-rapeseed in Bangladesh, and can cause yield loss up to 60% every year. A total of 27 cultivars of Brassica spp. where Brassica rapa (13), B. juncea (5) and B. napus (9) were selected for resistance screening against A. brassicicola. Two inoculation methods viz. detached leaf and seedling inoculation were assessed for checking the validation of inoculation technique using cultivated mustard-rapeseed varieties in Bangladesh a method to measure resistance to A. brassicicola. A significant positive correlation between the results of two inoculation methods was found in this study. The detached leaf technique was more suitable due to development of clear symptoms on the leaves within 36 hrs, and suitable for screening large scale genotypes for resistance. The 3rd leaves of 30 day-old were more suitable for inoculation having severe symptoms than the 4th leaves. Among 27 Bangladeshi mustard-rapeseed cultivars all cultivars expressed susceptible reaction to A. brassicicola, except BINA Sharisha-8, as it had border line resistance.

Dark leaf spot (Alternaria brassicicola) on Chinese cabbage: temporal spread and its influencing factors

2002 ◽  
Vol 53 (10) ◽  
pp. 1095 ◽  
Author(s):  
L. Y. Chen ◽  
T. V. Price
Keyword(s):  
Chinese Cabbage ◽  
Wind Direction ◽  
Leaf Spot ◽  
Irrigation System ◽  
Disease Incidence ◽  
Field Trials ◽  
Alternaria Brassicicola ◽  
Disease Spread ◽  
Average Wind ◽  
Temporal Spread

Temporal spread of dark leaf spot on Chinese cabbage was studied in experimental plots for 2 years. The effect of row orientation, the orientation of inoculated plants, and irrigation system on disease incidence and the effect of average wind direction on disease spread were investigated. A line source of inoculum in each plot was used for the 1993–94 summer and the 1994 spring–summer field trials, and 3 line sources for a 1995 autumn field trial. Disease progressed more rapidly in the 1993–94 summer than in the 1995 autumn. Disease epidemic did not develop in the 1994 spring–summer when environmental conditions were unfavourable. Disease incidence was higher in plots with row orientation parallel to the average wind direction than in plots with row orientation at right angles to the average wind direction for both the 1993–94 summer and the 1995 autumn trials. In summer 1993–94, across-row inoculation resulted in higher disease incidence than row inoculation did. No difference in disease incidence occurred between channel irrigation and overhead irrigation plots. Secondary infections always occurred adjacent to the source of inoculum and disease spread was influenced by the prevalent wind direction.

scholarly journals Biological Control of Alternaria brassicicola Causing Cabbage Black Leaf Spot Disease

2016 ◽  
Vol 44 (1) ◽  
pp. 229-230
Author(s):  
Soha Sabry ◽  
Ahmed Ali ◽  
Dawlat Abdel-Kader ◽  
Mohamed Abou-Zaid
Keyword(s):  
Biological Control ◽  
Leaf Spot ◽  
Alternaria Brassicicola ◽  
Leaf Spot Disease ◽  
Spot Disease ◽  
Black Leaf Spot

Vegetative compatibility grouping of Alternaria brassicicola causing black leaf spot in cauliflower

2018 ◽  
Vol 71 (1) ◽  
pp. 43-47
Author(s):  
Shaily Javeria ◽  
Swati Deep ◽  
Lakshman Prasad ◽  
Pratibha Sharma
Keyword(s):  
Leaf Spot ◽  
Vegetative Compatibility ◽  
Alternaria Brassicicola ◽  
Black Leaf Spot

Dark leaf spot (Alternaria brassicicola) on Chinese cabbage: spatial patterns

2005 ◽  
Vol 56 (7) ◽  
pp. 699 ◽  
Author(s):  
L. Y. Chen ◽  
T. V. Price ◽  
M. J. Silvapulle
Keyword(s):  
Chinese Cabbage ◽  
Leaf Spot ◽  
Disease Incidence ◽  
Field Trials ◽  
Alternaria Brassicicola ◽  
Disease Spread ◽  
Distance Class ◽  
Maximum Information ◽  
Spatial Spread ◽  
Core Cluster

The spatial spread of dark leaf spot caused by Alternaria brassicicola on Chinese cabbage was characterised over 2 years. The study was conducted in 2 field trials using ordinary runs, mapping, spatial autocorrelation, and 2-dimensional distance class analyses. Diseased plants were generally clustered and cluster orientation coincided with the line of inoculation. Disease spread was greater within than across rows. The maximum number of spatial lags with significantly positive autocorrelations occurred when disease incidence levels reached 20–80% in summer 1993–94. Core cluster size generally increased with disease incidence. Two-dimensional distance class analysis was the best analytical method among those used in describing spatial spread of the disease as it did not only provide maximum information but also considered missing data.

Mechanical Factors of Infl uence on Biological Effi ciency of Solanum Nigrum L.

2014 ◽  
Vol 1 (2) ◽  
pp. 20-23
Author(s):  
O. Ivashchenko ◽  
O. Ivashchenko
Keyword(s):  
Solanum Nigrum ◽  
Black Nightshade ◽  
Effi Ciency ◽  
Weed Plants ◽  
Sensitivity Level ◽  
Solanum Nigrum L ◽  
Small Plot ◽  
Mechanical Factors ◽  
The Moment ◽  
Working Out

Aim. Studying of black nightshade young plants’ response to the induced mechanical stresses. Methods. Researches conducted in small plot fi eld experiments. Results. Change of sensitivity level of Solanum nigrum L. plants depending on phases of their development at the moment of damage of elevated parts has been proven. Owing to loss of the surface capable to photosynthesis, there is an essential decrease in volumes of photosynthesis at plants of weed survived and their possibilities of ontogeny passage. The deep induced dis- stresses reduce biological effi ciency of plants, their ability to accumulate weight and to form seeds and even lead them to death. Conclusions. The defi ned principles of response of weed plants to the induced mechanical dis-stresses are can be used for working out and ecological receptions of crops protection from weeds.

Sign in / Sign up

Export Citation Format

Share Document