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Evaluation of Bio-pesticides and Botanicals for the Management of Lac Predators and Their Safety to Lac Insect

M. M. Rahman
LRS, Chapai Nawabgonj

D. Sarker
Entomology Division, BARI, Gazipur

S. N. Alarn
Entomology Division, BARI, Gazipur

Abstract/ Executive Summary:

An experiment was carried out at ber orchard of Lac Research Station, Chapainawabganj during July to October 2013. Results indicated that neem seed extract @ 10g crushed seed/litre of water was found effective reducing 78% Eublemma amabilis and 71% Pseudohypatopa pulverea population over control followed by Spinosad (Tracer 45 SC) @ 0.04% , which reduced 70% Eublemma amabilis and 63% Pseudohypatopa pulverea population over control. The highest lac yield (6.19 kg/tree) was also obtained form neem seed extract treated plants followed by Spinosad (Jracer 45 SC) @ 0.04% treated plants (5. 45kg/tree).

Keywords: Evaluation, Bio pesticides and botanical, Lac predators, Insect

Location: Lac Research Station, Chapainawabganj

Start Date: 00-07-2013

End Date: 00-10-2013

Program Area: Pest Management

Commodity: Insects

Objectives:

To evaluate of bio-pesticides and botanicals for the management of lac predators

Methodology:

The experiment was carried out in the ber orchard of Lac Research Station, Chapainawabganj during July to October 2013 kartiki lac crop season. Five treatments were studied and each treatment was replicated thrice following RCB design. The treatments were as follows: Tj=spraying neem seed extract @ 109 crushed seed/litre of water, T₂ = spraying of mahogoni seed extract @ 109 crushed seed/litre of water, T₃ = spraying of Spinosad (Tracer 45 SC) @ 0.02%, T₄ = spraying of Spinosad (Tracer 45 SC) @ 0.04% and T, = Control with water spray only. One ber plant around 15 years old was considered as one replication of a treatment. The host plants were inoculated by broodlac on 29 June 2013 with 50 sticks of30 em length in each plant. During inoculation, the broodlac sticks were tide onto the host branches both vertically and horizontally for the reason that the young shoots get full inoculation. After 7 days, when the inoculation was completed the broodlac sticks were collected from the host and brought them in the store for collection of sticklac.• After settlement of the lac insects on young shoots, 10 em length of 5 shoots taken from each replication and the number of nymphs were recorded separately at 16 days intervals up to crop harvest. After cell formation by the nymphs the population was enumerated on the estimated basis of the number of the cells on 10 ern length of 5 shoots taken from each replication. The individual cells were recorded with the help of a fine needle and forceps separately at 10 days interval up to crop harvest. Regular observations were made on the incidence of lac predators. The treatments were applied twice-first immediately after the pest infestation noticed while the second in one month after the first application. The appearance of lac predators, E. amabilis and P. pulverea were observed at 10 days interval up to crop harvest. This observation was made at the same time of counting of lac nymphs at the same place. The stages of the predator were examined and its number was recorded. The yield of sticklac was recorded separately during harvest. Percent mortality of lac insects was calculated on the basis of initial and fmal population data. Percent reduction of predator population was calculated over control treatment.

Source of Information: Annual Research Report, Entomology Division, BARI,2013-2014

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A significant difference of lac yield was observed in different treatments . The highest yield (6.19 kg/plant) was found in neem seed extract treated plants followed by 0.04% spinosad 45 SC treated plants (5.45 kg/plant) and the lowest yield (3.83 kg/plant) was recorded from untreated control plants.

Knowledge Management: Report/Proceedings