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Utpal Dey ¹, B. B. Sarkar ², D. N. Dhutraj ², S. L. Badgujar ²

Affiliations
1 Department of Plant Pathology, College of Agriculture, Marathwada Krishi Vidyapeeth, Parbhani M.S.
2 Department of Plant Pathology, College of Agriculture, Marathwada Krishi Vidyapeeth, Parbhani M.S., IN

Abstract

Rice earhead bug, Leptocorisa acuta Thunberg (Hemiptera: Alydidae) is found in almost all the countries where rice crop is grown. It, however, becomes more prevalent in rainfed wetland or upland rice. In Tripura, rice earhead bug (REB) is one of the major pests of rice crop leading to considerable field losses. Experiments were conducted in the field to evaluate the efficacy of some insecticides against REB, L. acuta. The results in field evaluation showed that all the insecticides are having significantly reduced pest population. The mortality percentage of L. acuta caused by different insecticides ranged from 74.01 to 97.03%. Among all the treatments tested, Quinolphos 25 EC gave the highest mortality(97.03%) as compared to untreated control (5.48%).

Keywords

Rice, Insecticides, Botanical, Leptocorisa Acuta, Field Evaluation

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D. P. Kuldhar ¹, S. L. Badgujar ¹, Utpal Dey ¹

Affiliations
1 Department of Plant Pathology, College of Agriculture, Marathwada Krishi Vidyapeeth, Parbhani M.S., IN

Abstract

Field experiment has been carried during Rabi, 2009, to find out pea varieties, germplasm lines and genotypes against pea wilt incited by Fusarium oxysporum f.sp. pisi. Among the pea verieties tested, Arkel was found most susceptible with significantly highest mean wilt incidence (22.66%), and this was followed by Latur local-1 (29 %) and Latur Local-2 (28%). Soldier was found moderately susceptible with mean wilt incidence of 19 per cent. Thus, pea variety Soldier may be preferred for sowing during first fortnight of October, so as to minimize the yield losses due to wilt incidence.

Keywords

Pea Wilt, Screening, F. Oxysporum F.sp. Pisi

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D. P. Kuldhar ¹, S. L. Badgujar ¹, Utpal Dey ¹

Affiliations
1 Department of Plant Pathology, College of Agriculture, Marathwada Krishi Vidyapeeth, Parbhani, M.S., IN

Abstract

An experiment has been conducted during Rabi season, 2009, to evaluate the effect of different soil types viz., black, red, sandy, sandy loam, and clay soil on incidence of pea wilt incited by Fusarium oxysporum f.sp. pisi. Results revealed that the disease was significantly highest in black soil (96.40%) followed by clay soil (58.00%). While, least wilt incidence was noticed on red soil (29.20%). It was recorded that the disease incidence varied from locality depending upon cropping pattern, environmental condition and inoculum buildup.

Keywords

Pea, Wilt, Fusarium Oxysporum F.sp. Pisi, Soil Types

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S. R. Jukte ¹, S. L. Badgujar ¹, A. P. Suryawanshi ¹, Utpal Dey ¹, D. P. Kuldhar ¹

Affiliations
1 Department of Plant Pathology, V.N. Marathwada Krishi Vidyapeeth, Parbhani (M.S.), IN

Abstract

Damping off diseases in okra is an economically most important and destructive disease of okra. The main characteristic symptom of the disease is pre- emergence damping off i.e. rotting of the seeds and seedlings before actual emergence from the soil and postemergence damping off which is severe when the seedlings are in cotyledonous stage. The infected tissues become soft and water soaked resulting in toppling over of the entire plant on the soil surface. The test pathogen (Pythium aphanidermatum) was isolated successfully on the basal culture medium Potato dextrose agar, from the seedlings showing typical symptoms of damping off. The pathogen produced nonseptate, well branched, colourless to white mycelium, lobed sporangia on indeterminate sporangiophores, and formation of resting spore (oospore) when observed under the microscope. Pathogenicity of P. aphanidermatum was proved by sick soil method in pot culture, sowing okra cv. PARBHANI KRANTI under screen house condition and by water agar method. The pathogen was reisolated on PDA from artificially diseased okra seedling, and compared its cultural and morphological characteristics with the original fungus isolated from the naturally damping off diseased okra plant.

Keywords

Damping Off, Isolation, Okra, Pythium spp., Pathogenicity, Symptomatology.

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