scholarly journals Diagnosis And In Vitro Control Of Tomato Leaf Spot Caused By Alternaria alternata In Sulaimani Governorate

2018 ◽  
Vol 2ndInt.Conf.AGR (Special Issue) ◽  
pp. 637-650
Author(s):  
Jalal Hama salih Ismael Ismael ◽  
◽  
Shallaw Adulrahman Omer Omer ◽  
Keyword(s):  
Alternaria Alternata ◽  
Leaf Spot ◽  
Tomato Leaf

scholarly journals Alternaria leaf spot of broccoli caused by Alternaria alternata in Bangladesh

2021 ◽  
Author(s):  
Sayma T. Nira ◽  
Md. Farhad Hossain ◽  
Nur Uddin Mahmud ◽  
Oliul Hassan ◽  
Md. Tofazzal Islam ◽  
...  
Keyword(s):  
Alternaria Alternata ◽  
Leaf Spot ◽  
Maximum Growth ◽  
Pathogenicity Test ◽  
Culture Studies ◽  
Alternaria Leaf Spot ◽  
Cultural Methods ◽  
Molecular Phylogenetic ◽  
Alternaria Sp

  This study aimed to isolate and characterise the pathogen associated with Alternaria leaf spot on broccoli and to evaluate the inhibitory effects of fungicides against it. We isolated and identified the fungal pathogen as Alternaria sp. using morphological and cultural methods. Based on the aligned sequences of the internal transcribed spacer (ITS) and molecular phylogenetic analysis by the neighbour-joining method, the isolates (Ab1 and Ab2) were confirmed as Alternaria alternata. The conidia of the isolates were dark brown, cylindrical, obclavate to muriform. The conidiophores were olivaceous brown, septate, and branched. The conidial morphology of the isolates ranged from 52.4–92.4 × 10–20 μm with 2–6 transverse and 0–3 longitudinal septa. Both isolates yielded positive results in the pathogenicity test on broccoli leaves by developing brown and circular spots with concentric rings on the leaves surrounded by yellow halos. The culture studies revealed that the maximum growth of the pathogen was obtained at 30 °C and pH 6.0. Tilt 250 WC showed the highest potential in suppressing the mycelial growth of the A. alternata in vitro at a concentration as low as 50 µg/mL. The results from this study contributed to the positive identification of the pathogen and characterised A. alternata as a destructive pathogen of broccoli which may be successfully controlled by the fungicide Tilt.  

In-Vitro Efficacy of Different Fungicides Against Leaf Spot of Marigold Caused by Alternaria alternata

2021 ◽  
Vol 1 (1) ◽  
pp. 1-4
Author(s):  
Keyword(s):  
Lower Limit ◽  
Alternaria Alternata ◽  
Leaf Spot ◽  
Disease Incidence ◽  
Colony Growth ◽  
Good Effect ◽  
Upper Limit ◽  
Disease Occurrence ◽  
Chemical Fungicides

This study was carried out to study the in-vitro efficacy of different chemical fungicides leaf spot of marigold, caused by Alternaria alternata. The results of present study showed that the disease incidence from various locations of district Hyderabad Sindh was observed Ghangra Mori 35%, TandoHyder 30%, Rahooki 25%, Moosa Khatyan20%, and Hosri 15%. Upper limit disease occurrence was observed from Ghangra Mori and lower limit sickness was recorded from Hosri. The chemical fungicide Nativo observed 43%, 25.5% and 18.5% linear colony growth of Alternaria alternata at 100, 200 and 400 ppm, respectively. Aliete observed 52, 31.5 and 21 respectively. Carbandazm observed 52.5, 29.5 and 21mm respectively and Mancozeb observed 51, 28.5 and 20mm respectively. Lower limit growth of Alternaria alternata were judge in 400 ppm instead Nativo pursuited by Mancozeb, Carbandazm and Aliete, separately. In control there was 90mm was recorded. It was concluded that chemical fungicide ‘Nativo’ were full effective to stop the disperssion of Alternaria alternata in 400 ppm. Anytime the plant infusion, Neem infusion show good effect opposite linear colony growth of Alternaria alternata on 6% solution

scholarly journals In-Vitro Efficacy of Different Botanical Extract against Leaf Spot of Marry Gold caused by Alternaria alternat

2021 ◽  
Vol 1 (1) ◽  
pp. 05-08
Author(s):  
Keyword(s):  
Alternaria Alternata ◽  
Leaf Spot ◽  
Disease Incidence ◽  
Colony Growth ◽  
Garlic Extract ◽  
Ginger Extract ◽  
Neem Extract ◽  
Botanical Extracts ◽  
Botanical Extract

This study was carried out to study the in-vitroefficacy of different botanical extracts against leaf spot of marigold, caused by Alternaria alternata. The results of present study showed that the disease incidence from variouslocations of district HyderabadSindhwas observed Ghangra Mori35%, TandoHyder 30%, Rahooki25%, Moosa Khatyan20%, and Hosri15%.Upper limitdisease occurrencewas observedfrom Ghangra Mori and lower limit sickness was recordedfrom Hosri. The botanicalplantextract ‘Neem’ observed 48, 40and 34mmlinear colony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively, Dhaturaextract observed 75.5, 63 and 57.5mmcolony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively. Garlic extract observed 49%, 43% and 36% linear colony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively. Ginger extract observed 50, 43.5and 36.5mmcolony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively. Minimum linear colony growth of Alternaria alternatawas observed at 6% concentration for Neem extract followed by Garlic extract, Ginger extract and Datura extract, respectivelythe plant infusion, Neeminfusion show good effectoppositelinear colony growth of Alternaria alternataon6% solution

In vitro Reaction of Sunflower (Helianthus annuus L.) to the Toxin(s) Produced by Alternaria alternata, the Casual Agent of Brown Leaf Spot

1996 ◽  
Vol 144 (9-10) ◽  
pp. 465-470 ◽  
Author(s):  
S. Kintzios ◽  
A. Koliopoulos ◽  
E. Karyoti ◽  
J. Drossopoulos ◽  
C. D. Holevas ◽  
...  
Keyword(s):  
Helianthus Annuus ◽  
Alternaria Alternata ◽  
Leaf Spot ◽  
Helianthus Annuus L ◽  
Brown Leaf Spot ◽  
Brown Leaf

Effect of Copper Oxide and Silver Nanoparticles on the Development of Tolerance to Alternaria alternata in Poplar in Vitro Clones

2021 ◽  
Vol 16 (2) ◽  
pp. 231-238
Author(s):  
T. A. Grodetskaia ◽  
O. A. Fedorova ◽  
P. M. Evlakov ◽  
O. Yu. Baranov ◽  
O. V. Zakharova ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Copper Oxide ◽  
Alternaria Alternata ◽  
Effect Of Copper ◽  
Development Of Tolerance

scholarly journals First Report of Alternaria alternata Causing Leaf Spot of Senecio cannabifolius in China

Plant Disease ◽  
2019 ◽  
Vol 103 (5) ◽  
pp. 1028
Author(s):  
S. Chen ◽  
D. Yang ◽  
L. Yang ◽  
H. Yuan
Keyword(s):  
Alternaria Alternata ◽  
Leaf Spot ◽  
First Report
Sign in / Sign up

Export Citation Format

Share Document