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Borah, R. K.
- Cherrapunjee's Forest-fire: Need Immediate Control Measure
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Indian Forester, Vol 136, No 3 (2010), Pagination: 382-387Abstract
Forest Fire, an anti environmental human activity, is becoming a great threat for eco restoration of Cherrapunjee-the site famous as wettest place on earth. Human's carelessness, negligence and ignorance are the main causes of annual ground fire resulting into pronounced and prolonged ill effect on climate, land use, land cover, biodiversity and forest ecosystem. There is an urgent need of fire management practices based on scientific technology, where emphasis should be given on people's participation through Joint Forest Management Programme.Keywords
Wildgroundfire, Ill Effects, Management, Cherrapunjee
- Vertwillium Wilt of Polyalthia longifolia - a New Disease Report from India
Abstract Views :288 |
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Indian Forester, Vol 136, No 3 (2010), Pagination: 388-392Abstract
Verticillium dahliae was identified as a pathogen causing wilt disease of Polyalthia longifolia. It was isolated from the infected ischolar_mains of the seedlings collected from Central Forest Nursery of Imphal, Manipur, India. Four fungicides viz. Bavistin 50% WP, Dithane M-45, Dithane Z-78 and Fytolan 50% WP were screened against the pathogen at different concentrations using poison food technique in vitro and then in field-conditions using soil drenching technique. The results revealed that Bavistin 50% WP was most effective at 75 ppm with 100% growth inhibition followed by Dithane M-45, Dithane Z-78 and minimum efficacy was observed by Fytolan 50% WP with 31.27% growth inhibition in laboratory conditions. All selected fungicides were evaluated against pathogen in field conditions at 0.1% and 0.2 % concentrations. Bavistin 50% WP was found to be the most effective at 0.2% concentration. Thus the present study recommends soil drenching with Bavistin 50% WP at aminimal concentration of 0.2% for management of the disease.Keywords
Verticillium dahliae, Wilt, Polyalthia Longifolia, Disease Management- Biocontrol of Five Invasive Weeds of Meghalaya-A Case Study
Abstract Views :313 |
PDF Views:153
Authors
Affiliations
1 Rain Forest Research Institute, Post Box No. 136, Jorhat - 785001, Assam, IN
1 Rain Forest Research Institute, Post Box No. 136, Jorhat - 785001, Assam, IN
Source
Journal of Biological Control, Vol 33, No 2 (2019), Pagination: 137-142Abstract
The state of Meghalaya, in North East India is endowed with a dense cover of natural forest. A vast majority of the forests are owned by communities who traditionally practice shifting cultivation. This has resulted in significant reduction of the original forest area leading to a drastic change in the floristic composition of the state. This is evident by the ubiquitous presence of various invasive weeds such as Mikania micrantha, Chromolaena odorata, Ageratum conyzoides, Spilanthes paniculata and Spermacoce hispida. A survey for natural fungal enemies against these weeds was carried out in the state with the objective of identifying potential biocontrol agents. A total of six pathogenic fungi were isolated from infected leaves of these target weeds. Of these, two fungi isolated from leaf spot and leaf necrosis disease of Mikania micrantha were identified as Gliocladium roseum and Phomopsis sp., respectively. The fungus isolated from S. paniculata, C. odorata, and A. conyzoides was Fusarium solani and from Spermococe hispida it was F. acuminatum. Pathogenicity test carried out on target weeds and agricultural crops grown in Meghalaya (Maize, Chilli, Tomato, Rice and Ginger) showed that all the isolated fungi were found infecting the weeds from which they were isolated and also maize and tomato. They were found non non pathogenic to seedlings of some economically important tree species of Meghalaya, viz., Pinus kesiya, Magnolia champaca, Alnus nepalensis, Chukrasia tabularis, Exbucklandia populnea and Castanopsis indica. Hence, these fungi can be tested in field condition on pilot scale, in forest areas but not in agricultural areas where maize or tomato is grown.
Keywords
Biocontrol, Fungi, Invasive, Meghalaya, Weeds.Full Text
References
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- Effect of IPM Modules on Major Pests and their Natural Enemies in King Chilli Capsicum Chinense in Northeast India
Abstract Views :96 |
PDF Views:59
Authors
Affiliations
1 College of Horticulture, Central Agricultural University (Imphal), Thenzawl, Mizoram 796186, IN
2 College of PG Studies in Agricultural Sciences, Central Agricultural University (Imphal), Umiam, Meghalaya 793103, IN
3 Department of Entomology, Assam Agricultural University, Jorhat, Assam 785013, IN
4 Department of Plant Pathology, Assam Agricultural University, Jorhat, Assam 785013, IN
5 KVK, Central Agricultural University (Imphal), Andro, Manipur 795049, IN
1 College of Horticulture, Central Agricultural University (Imphal), Thenzawl, Mizoram 796186, IN
2 College of PG Studies in Agricultural Sciences, Central Agricultural University (Imphal), Umiam, Meghalaya 793103, IN
3 Department of Entomology, Assam Agricultural University, Jorhat, Assam 785013, IN
4 Department of Plant Pathology, Assam Agricultural University, Jorhat, Assam 785013, IN
5 KVK, Central Agricultural University (Imphal), Andro, Manipur 795049, IN
Source
Indian Journal of Entomology, Vol 84, No 1 (2022), Pagination: 105-108Abstract
A field experiment to evaluate some IPM modules against major pests viz., Aphis gossypii, Myzus persicae, Bemisia tabaci and their natural enemies viz., coccinellids and spiders occurring in king chilli Capsicum chinense Jacquin was carried out during rabi (2014-16) at Jorhat, Assam. The results revealed that module M2 with seedling root dip treatment with imidacloprid 17.8 SL @ 40g a.i./ ha + growing of border crop (okra)+ spraying of imidacloprid 17.8SL @ 40g a.i./ ha at 20 days after transplanting at 15 days interval is the most effective in suppressing aphids and whitefly followed by lambdacyhalothrin instead of imidacloprid in both the seasons. The insecticidal treatment modules had a significant effect on the pest and the viral diseases, thereby increasing the yield, with maximum yield obtained in module M2 (3564.44 kg/ ha) and with a maximum cost-benefit ratio of 1: 4.85.Keywords
Capsicum chinense, IPM modules, Aphis gossypii, Myzus persicae, Bemisia tabaci, coccinellids, spiders, imidacloprid, lambdacyhalothrin, seed treatment, spray, yield, cost benefits, AssamFull Text
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