Leaf blight of sunflower

Alternaria helianthi the causal agent of sunflower leaf blight was isolated from a monoconidial culture derived from blight infected sunflower leaves of MSFH-8.Alternariahelianthi was first cultured on PDA and then transferred to Potato Dextrose broth. Toxin was purified from the cultural filtrate by treatment with organic solvents. The identity of the toxin was established by estimating carbohydrate and protein content. Based on the quantity of carbohydrate and protein the toxin was identified as glycoproteinaceous in nature.

5p gaocaolon9 22-12-2020 15 2   Download

Sunflower is an important major oilseed crop ranks next to groundnut and soybean at global level. It belongs to the family Asteraceae and mostly infected by several fungal, bacterial and viral diseases among which leaf spot and blight caused by Alternaria helianthi was considered as one of the most destructive diseases in the sunflower growing areas. An experiment was studied to determine the disease incidence and intensity of the disease in both Kharif and Rabi season (2018-19) by observing the plant raised in field.

10p kethamoi7 26-08-2020 13 2   Download

The efficacy of twelve microbial biocontrol agents viz., Trichoderma viride T. viride strain 16 T. viride strain 60 T. harzianum T. harzianum strain 2 T. harzianum strain 55 Pseudomonas fluorescens and Bacillus subtilis were evaluated by dual culture technique against Alternaria helianthi. In vitro efficacy of six fungicides viz., Mancozeb, Iprodione, Propiconozole, Chlorothalonil, Hexaconozole and Difenconozole were evaluated by food poison technique.

5p cothumenhmong4 23-03-2020 17 0   Download

Four fungal bio-control agents, viz., Trichoderma harzianum, T. viride, Aspergillus spp. and Tricothecium spp. were evaluated in vitro through dual culture technique against Alternaria helianthi, the causative agent of leaf blight of sunflower and Fusarium oxyporum f. sp. phaseoli, the causative agent of vascular wilt of beans. The observations were taken after fourth and seventh day for both the pathogens. After fourth day, observations recorded in case of A.

10p cothumenhmong3 22-02-2020 16 0   Download

Field experiment was conducted at Oilseeds Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola during kharif 2013 -14 and 2015-16, to study integrated management of Alternaria leaf blight and necrosis of Sunflower. Seed primimg with Trichoderma viride @10g/kg seed, Carbendazim 50 WP @ 2g/kg seed + Thiamethoxam 600 FS @ 4g/kg seed, Trichoderma viride @10g/kg seed + Thiamethoxam 600 FS @ 4g/kg seed with foliar spray of Propiconazole 25 EC @ 1ml/l + Thiamethoxam 25 WG @ 1.6g/l, 25 EC @ 1ml/l + Azadirachtin 1500 ppm @ 1.

9p kethamoi2 14-12-2019 14 0   Download

Alternaria leaf blight of sunflower caused by Alternaria helianthi is an important disease of sunflower. The study conducted on in vitro evaluation of new molecules of fungicides and plant extracts against Alternaria helianthi, causal agent of Alternaria blight of sunflower. In vitro evaluation of fungicides revealed that, among four systemic fungicides hexaconazole and propiconazole were highly effective in inhibiting the mycelial growth with 100% inhibition among non systemic fungicides the maximum inhibition of mycelial growth was found in captan (86.

8p cothumenhmong1 08-12-2019 15 0   Download