Journal of Tea Science Research. 2015, Vol. 5, No. 8, 1-7
1
Research Report Open Access
Evaluation of Some Plant Origin Commercial Biopesticides against Red
Spider Mite,
Oligonychus coffeae
Nietner (Acarina: Tetranychydae) in Tea
Mamun M.S.A.
1,2
, Hoque M.M.
1
, Ahmed M.
2
1. Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet, Bangladesh
2. Entomology Division, Bangladesh Tea Research Institute, Srimangal, Moulvibazar, Bangladesh
Corresponding author email
Journal of Tea Science Research, 2015, Vol.5, No.8 doi: 10.5376/jtsr.2015.05.0008
Received: 30 Mar., 2015
Accepted: 18 Aug., 2015
Published: 20 Oct., 2015
© 2015 Mamun et al., This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:
Mamun M.S.A., Hoque M.M. and Ahmed M., 2015, Evaluation of some plant origin commercial biopesticides against red spider mite,
Oligonychus
coffeae
Nietner (Acarina: Tetranychydae) in tea,
Journal of Tea Science Research, 5(8), 1-7
(doi
Abstract
An experiment was conducted to evaluate some plant origin commercial biopesticides against red spider mite in tea under
both in the Entomology Laboratory and main farm of Bangladesh Tea Research Institute (BTRI), Srimangal, Moulvibazar during the
period from March 2013 to December 2014. Bio-Cawach (
Pongamia pinnata
), Karanza
(Azadirachta indica + Pongamia pinnata),
Miticon (Various herbs, alkaloids and salt of fatty acids), Neemakar (Neem, Karanja & Tulsi), Rescue (
Vitex negundu +
Clerodendron infortunatum)
and Torpedo (
Sophora alopecuroides + Stemona sessilifolia)
were considered as treatments and dosages
were @ 0.8 ml, 1.0 ml, 1.0 ml, 1.0 ml, 0.5 ml and 0.5 ml, respectively. Data were collected at 24 HAT, 48HAT, 72HAT (Hours after
Treatment) in the laboratory and at weekly interval in field condition. Results indicated that all the biopesticides showed the toxic
effect on red spider mite in tea and significantly reduced mite population both in laboratory and field conditions. In laboratory
condition, Miticon showed the highest (93.28%) toxic effect at 72HAT followed by Karanza (92.55%) against red spider mite where
as Bio-Cawach, Neemakar, Rescue and Torpedo exhibited pronounced acaricidal action (89.78%~91.67%) at 72HAT. Similar trend
of toxicity was found at 24HAT & 48HAT. The mortality was in a linear trend i.e. increasing with increasing of time. From the field
evaluation, it was found that the highest (81.34%) reduction in mite population was observed in Miticon treated plot followed by
Rescue treated plot (81.01%). The lowest (74.07%) reduction in mite population was observed in Bio-Cawach treated plot. The order
of toxicity of the six plant origin commercial biopesticides on adult red spider mite in both laboratory and field condition was:
Miticon>Rescue>Neemakar>Karanza>Torpedo>Bio-Cawach. Application of the tested biopesticides did not affect the natural
predators such as
Stethorus gilvifrons
and
Oxyopes
sp. Tea samples made from biopesticide-treated shoots were found taint free when
subjected to organoleptic evaluation. These eco-friendly low cost plant products can therefore be incorporated in the strategy of
integrated pest management (IPM) to reduce the load of chemical pesticides in tea.
Keywords
Tea; Red Spider Mite;
Oligonychus coffeae
; IPM; Plant Products; Biopesticides
Introduction
Tea, a popular health beverage in the world, is produced
from the leaves of evergreen shrub
Camellia sinensis
L (O Kuntze). It is a perennial crop grown under
monoculture on large contiguous areas providing
favourable conditions for a variety of pests. Tea plants
are subjected to the attack of several pests such as
insects, mites and nematodes. In world tea, 1034
species of arthropods and 82 species of nematodes are
associated with tea plants (Chen and Chen, 1989). In
Bangladesh tea, so far 25 insects, 4 mites and 10
species of nematodes have been recorded (Ahmed,
2005). Among them, Tea mosquito bug, Red spider
mites & Termites are the major pests in mature tea
plantation; while Aphids, Jassids, Thrips, Flushworms
and Nematodes are the major pests in nursery and
young tea plantation (Mamun and Ahmed, 2011). Mite
pests are the notorious pests of many agricultural
crops over the world. More than 60,000 species of
mites have been described from various regions of the
world (Evans, 1992). Red spider mite,
Oligonychus
coffeae
Nietner (Acarina: Tetranychidae) is one of the
major and serious pests of tea in all most all tea
producing countries of south-east Asia and African
countries. Hundreds of spider mites are found on the
upper and undersurface of every tea leaf, together with
