Introduction to Lac and Lac Culture - Birsa Agricultural University
Introduction to Lac and Lac Culture - Birsa Agricultural University
Introduction to Lac and Lac Culture - Birsa Agricultural University
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Sl. No. Insect Preda<strong>to</strong>r Order Family<br />
<strong>Introduction</strong> <strong>to</strong><br />
<strong>Lac</strong> <strong>and</strong> <strong>Lac</strong> <strong>Culture</strong><br />
8. Phroderces falcatella ,, Cosmopterygidae<br />
9. <strong>Lac</strong>ciferophaga yunnanea ,, Momphidae<br />
10. Chrysopa madestes Neuroptera Chrysopidae<br />
11. C. lacciperda ,, ,,<br />
12. Berginus maindroni Coleoptera Myce<strong>to</strong>phagidae<br />
13. Silvanus iyeri ,, Cucujidae<br />
14. Tribolium ferrugineum ,, Tenebrionidae<br />
15. Phyllodromia humbertiana Dictyoptera Blattellidae<br />
16. Ischonoptera fulvastrata ,, ,,<br />
Eublemma amabilis <strong>and</strong> Pseudohypa<strong>to</strong>pa pulverea are the most destructive key pests of lac insects<br />
<strong>and</strong> are in regular occurrence but their incidence may vary from season <strong>to</strong> season, place <strong>to</strong> place <strong>and</strong><br />
crop <strong>to</strong> crop.<br />
(i) Eublemma amabilis :<br />
It is the most destructive preda<strong>to</strong>r of lac insect <strong>and</strong> causes most damage during katki <strong>and</strong> aghani lac<br />
crops i.e. during the rainy season in comparison <strong>to</strong> the other two crops.<br />
Life his<strong>to</strong>ry :<br />
A single female moth lays greyish, flat <strong>and</strong> rounded eggs singly on the test of lac insect. The newly<br />
hatched larvae, 0.51 <strong>to</strong> 0.54 mm long, get at the lac insect either through the opening of the test or<br />
by tunneling a hole through encrustation. A single larva can destroy 40-60 lac insect cells in its whole<br />
larval period. It has six generations in a year <strong>and</strong> the duration of the generations are about 37, 45,<br />
42, 125, 80 <strong>and</strong> 40 days respectively. Attacked lac cells can easily be identified because of its pinkish<br />
colouration due <strong>to</strong> presence of pink coloured discs of excreta inside the hollow lac cells.<br />
(ii) Pseudohypa<strong>to</strong>pa pulverea :<br />
It is also destructive preda<strong>to</strong>r of lac insects <strong>and</strong> found in all lac growing areas of the country. It feeds<br />
on the live <strong>and</strong> dead lac insects <strong>and</strong> is found in large numbers in s<strong>to</strong>red lac <strong>and</strong> so it is responsible for<br />
the qualitative <strong>and</strong> quantitative deterioration of s<strong>to</strong>red lac.<br />
Life his<strong>to</strong>ry<br />
It lays oval (0.5 mm X 0.3 mm), colourless eggs, singly on the test of lac insects. Larvae pass normally<br />
through 5 instars but the hibernating larvae have nine instars. The newly hatched larva is about 1.35<br />
23
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