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Entomology
Lac culture
Entomology

Lac culture

Agriculturist Musa February 1, 2018

Contents

  • 1 Lac culture
    • 1.1 Species
    • 1.2 Types
    • 1.3 Host Plant
    • 1.4 Lac production Technology
  • 2 Prospect of Lac culture in Bangladesh
    • 2.1 Uses of Shellac 

Lac culture

The commercial cultivation of lac insects is known as lac culture.

Species

Four species of lac insects are
1. Kerria lacca.
2. Tachardia signoret.
3. Tachardiella cockrell.
4. Tachardina cockrell. 
Kerria lacca is available in Bangladesh.
 

Types

Depending on the cultivation procedure, lac insect are two types
1. Kusumi (2 types)
                   a) Aghani. b) Juhi.
2. Ranginee (2 types)
                   a) Katki. b) Baishaki.
Ranginee is available in Bangladesh and Kusumi practiced in India.

Host Plant

a) Jujube/ber.
b) Kusum.
c) Polash.
d) Acacia.
e) Fig etc.

Lac production Technology

Seed lac
            Rearing and harvesting
Raw lac/ Stick lac
                               Scraping, Sieving
Bully lac
                Wash in water
Choury lac
                 Purification by heat and add chemical
Sellac
Seed lac: Lac insect are borne in plant, specially on the growing point of the plant. The twig which we select for seed lac must be 15­-30 cm in length and most of the lac insect remain in  egg stage.
 
Raw lack/Sticky lac: After preparation of seed lac, it will be attached with the 
growing point of the host plant. Seed lac is kept in this condition for about two weeks. By this time, the egg will hatch and migrate to the host plant. When the lac insect spread all over the host plant, theseed lac is to removed from the host plant. Lac insects havepiercing sucking type mouthparts.

They will suck cell sap from the host plant by this time they attain nymphal period and secret resin from their formal gland. A layer of resin about 0.6to 1.3 cm built in the host plant. The twig of the host plant with resin is cut and collect lac from them. This is 
called raw/stick lac.
 
Buly lac: From raw lac or stick lac, we get buly lac through scraping and Sieving. 
The buly  lac is washed with water for several times.
Choury lac: After washing of buly lac, the lac which we get is called choury lac.
 
Shellac: Afterword purification may be done or may not be done. If purification is 
done, heat is applied for boil and then the lac is kept in different shape container giving in different  shape. After this process the lac which we obtain is called shellac. 

Prospect of Lac culture in Bangladesh

In Bangladesh seed lac are grown two different times. One time is June–July and harvesting  period  in  the  month  of  October–November.  Another  time  is  October–November  and  harvesting in the month of June–July. 
To obtain more amount of lac, twig is needed and for this season host plant is to be pruned for  two times.   
▲ February–March.  
▲ May–June. 
Immediate after pruning, nitrogenous fertilizer have to be applied around the host plant which  will make the host plant succulent and this is suitable for lac insect to suck.
 

Uses of Shellac 

▲ It was used in ancient time as wood finish, skin cosmetic and dye for wool and silk.
 
▲ Lac for dye has been somewhat replaced by the emergence of synthetic dyes though it  remains in use, and some juices, carbonated drinks, wine, jam, sauce, and candy are coloured  using it. 
 
▲ Lac is used in folk medicine as a hepatoprotective and anti­obesity drug. 

▲ It is used in violin and other varnish and is soluble in alcohol.

▲ Nail polish, lipstick, gala, Jewellery shop, toys etc are prepared from lac. 
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Agriculturist Musa

Agriculture is the key development in the rise of sedentary human civilization. As an agriculture student, I want to make a positive footprint in the young agriculturist community through this blog.

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