Abstract
Field experiments were conducted in 2013-14, 2014-15 and 2015-16 planting seasons to evaluate the efficacy of different sources of organic materials and a nematicide Furadan 5G in the control of <i>Meloidogyne incognita</i> infection on the major spices onion, <i>Allium cepa</i> L. The organic materials (poultry refuse, mustard oil cake, rice bran and sawdust) were incorporation with the soil 3 weeks before transplanting of onion seedlings whereas Tricho-composts were added in the soils 5 days before seedling transplanting. The results showed that different organic materials displayed varying levels of effective to the nematode infection. All the treatments gave satisfactory reduction of gall development on roots and increased plant growth as well as yield of onion. Among the treatments, Tricho-composts and poultry refuse appeared to be the best amendments for root knot nematode reduction and significantly influenced the growth of the onion with the highest yield. Saw dust, rice bran and nematicide Furadan 5G were also proved to be better amendment for reduction of root knot nematode which enhanced plant growth and increased yield of onion. These results suggest that exploitation of organic soil amendment in nematode management would be a useful control measure in onion production in Bangladesh.
Highlights
Onion (Allium cepa L.) is one of the most important and familiar crop spices specially bulb onion through the world
The lowest severity of root-knot disease of onion was recorded from the treatment with Tricho-compost-2, which was followed by poultry refuse, Furadan 5G, mustard oilcake and Tricho-compost-1 (Table 1)
Soil treatment with Tricho-compost-2 gave the American Journal of Bioscience and Bioengineering 2019; 7(4): 57-64 highest reduction of root-knot severity 60.80% compared to control followed by poultry refuse, Furadan 5G, mustard oilcake and Tricho-compost-1 where the reduction of rootknot disease severity was 60.78%, 59.94%, 57.98% and 57.14%, respectively
Summary
Onion (Allium cepa L.) is one of the most important and familiar crop spices specially bulb onion through the world. It is a member of the family Alliaceae. It is used as popular vegetable in many countries of Asia and very common and favorable spice in Bangladesh. It ranks first in the area (419122 ha) and production (1704402 MT) [1]. Among them M. incognita and M. graminicola are known as onion root knot nematode, which are the common pest of the crop. Meloidogyne spp. have a wide host range belonging to many plant species but onion is the most suitable host among them [11]
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