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Showing posts with label Pyrethrum cinerarifolium. Show all posts
Showing posts with label Pyrethrum cinerarifolium. Show all posts

Pyrethrum seeds

Pyrethrum plant

Pyrethrum Himalaya is economically important as a natural source of insecticide. The flowers are pulverized and the active components called pyrethrins, contained in the seed cases, are extracted. Pyrethrins attack the nervous systems of all insects, and inhibit female mosquitoes from biting. When not present in amounts fatal to insects, they still appear to have an insect repellent effect. They are harmful to fish, but are far less toxic to mammals and birds than many synthetic insecticides and are non-persistent, being biodegradable and also breaking down easily on exposure to light.

Common Name : Pyrethrum
Botanical Name : Pyrethrum (Tanacetum cinerarifolilum 
Plant : The plants bear numerous flower heads which measures 6-9 mm when closed, and 9-12 mm, when open. The involucres consist of 2-3 mm of yellowish or greenish yellow, lanceolate hair bratcs. Each flower head bears a receptacle 4-8 mm in diameter
 
Soil and Climate : Fertile and well–drained soil is the best for growing pyrethrum successfully.
         
Cultivation : Pyrethrum is generally propagated by seed as well as the crop can also be raised vegetative by splits. It is successfully grown in plains through seedling prepared by seed in nursery.
 
Seed rate : Seed 500 gram of seed should be shown in about 50 square meter land for growing nursery for one hectare of land (About 50,000 seedlings).
 
Preparation of fields : For field preparation one two ploughing with mould board plough followed by 2-3 harrowing and planking are required to get a fine tilth.
 
Preparation of Nursery : Two to three harrowing are enough for preparation of seed beds.
 
Manures and fertilizers : Crop responds well to increase level of 60 kg/h Phosphorus.
 
Intercultural : Pyrethrum crop requires weed free condition particularly in the initial stage of establishments.
 
Irrigation : Pyrethrum require irrigation every fortnight from planting to harvesting.
 
Harvesting and drying : Three harvests of flower are obtained as the following continues for 9 months. The crops give poor yield during the first yeas and the optimum yields are obtained only during 2nd and 3rd year.
 
Yield of flower and pyrethrins content : 225-250 kg/ha/year Flower yield and pyrethrins contents in flower depends on agro-climatic condition and cultural practices.

No of seeds 100 seeds/per packet
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