Moringa (Moringa oleifera) leaf extracts inhibit spore germination ofAlternaria solani, causal agent of early blight disease of tomato (Solanum lycopersicum)

Present experiment was conducted at College of Horticulture, Bengaluru (KA) during year 2017–18 to study the cultural, morphological and biochemical variations among the isolates of the pathogen Alternaria solani, the causal agent of early blight disease in tomato. The results revealed variation among the isolates collected from different regions of Karnataka state, India with regard to the colony characteristics viz., colony colour, mycelial growth pattern, margin of the colony and zonations whereas the maximum mycelial growth in terms of diameter (90 mm) was observed in the isolates Bagalkot (BaBG) and Chikkamagaluru (CMH) on Czapek’s (Dox) agar medium while the least growth (36.33) was noticed in Bidar (BiHH) isolate. The isolate could grow better on Czapek’s (Dox) agar medium as among the 3 media tested Czapek’s (Dox) agar medium produced maximum growth of 80.70 mm and the least growth (63.70 mm) was noticed in V-8 juice agar. The morphological studies revealed that all the conidia of various isolates varied in length (25.07–42.90 µm), breadth (10.53–21.52 µm) and number of horizontal septa (2–7), longitudinal septa (0–4). Biochemical studies among the isolates revealed significant variation in their enzyme activities. The peroxidase activity was more in Chikamagaluru (CMH) isolate (81.80 Unit g-1 FW) least activity was found in Bidar (BiHH) isolate 11.78 Unit g-1 FW whereas the esterase activity was more Bengaluru (BYC) isolate (69.01 Unit g-1 FW) least activity was found in Bagalkot (BaBG) isolate 11.78 Unit g-1 FW. Existence of variation among the isolates of Alternaria solani evident from the results obtained.

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Early blight disease management by herbal nanoemulsion in Solanum lycopersicum with bio-protective manner

Industrial Crops and Products ◽

10.1016/j.indcrop.2020.112421 ◽

2020 ◽

Vol 150 ◽

pp. 112421 ◽

Cited By ~ 1

Author(s):

Shipra Pandey ◽

Ved Prakash Giri ◽

Ashutosh Tripathi ◽

Madhuree Kumari ◽

Shiv Narayan ◽

...

Keyword(s):

Disease Management ◽

Solanum Lycopersicum ◽

Early Blight ◽

Blight Disease

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Impact of Alternaria solani (Early blight) on cultivated tomato (Solanum lycopersicum L.) in North-eastern region of India and identification of early blight disease resistant tomato genotypes

Journal of Applied and Natural Science ◽

10.31018/jans.v7i2.665 ◽

2015 ◽

Vol 7 (2) ◽

pp. 672-680

Author(s):

Khaidem Malemnganba Meitei ◽

G.C. Bora ◽

Senjam Jinus Singh ◽

Anjan Kumar Sinha

Keyword(s):

Solanum Lycopersicum ◽

Early Blight ◽

Disease Incidence ◽

Fruit Weight ◽

High Yield ◽

Eastern Region ◽

Solanum Lycopersicum L ◽

North Eastern ◽

Blight Disease ◽

Tomato Genotypes

The present investigation was carried out to screen genotypes for resistance to Early blight disease of tomato (Solanum lycopersicum L.) of North Eastern region of India. Field trial was conducted in the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat during the years 2012-13 and 2013-14 consecutively. The disease severity of tomato genotypes was assessed by 0-5 points scale, percent Disease Incidence (PDI). Of the total materials screened, Sel-35 (TLBRH-6 X Konbilahi) and Sel-19 (TLBRH-6 X Konbilahi) were highly resistant, 7 were resistant, 14 were moderately resistant, 16 were susceptible and 6 were highly susceptible under field condition after inoculation during both years. The genotype having high yield and resistant to early blight was 10/TOLCVRES-3. The genotypes resistant to early blight but having low yield (Sel-35, Sel-19, Sel-9 and Sel-16) may be utilized in future breeding programme for improving yield through selection for higher fruit weight and fruit diameter. Alternatively, they may be used as parents in hybridization or backcrossing programme in order to transfer the gene for resistance to early blight to already adapted high yield varieties.

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