Start Submission Become a Reviewer

Reading: Bio-pesticides for the Control of Two–spotted Spider Mite, Tetranychus urticae Koch, in Stra...

Download

A- A+
Alt. Display

Original Articles

Bio-pesticides for the Control of Two–spotted Spider Mite, Tetranychus urticae Koch, in Strawberry Cultivations

Authors:

M. T. M. D. R. Perera,

Department of Agriculture, Gannoruwa, Peradeniya, LK
About M. T. M. D. R.
Plant Protection Service
X close

N. Senanayke ,

Rajarata University of Sri Lanka, Anuradhapura (50000) 0000-0001-7026-3816, LK
About N.
Senior Lecturer (Retired), Faculty of Agriculture
X close

Chamika Perera

Jagro Farms LTD , Nuwara Eliya, LK
About Chamika
Senior Agronomist
X close

Abstract

Strawberry is cultivated in polytunnels and open field cultivations in Nuwara Eliya district. Recently, a severe infestation of the Two Spotted Spider Mite (TSSM) in strawberry was reported and the farmers observed Department of Agriculture (DOA) recommended insecticide Abamectin was ineffective. Therefore, two Bio-pesticides; M-Impact and Hort-Impact were tested in three locations of Jagro Farms Ltd, Nuwara Eliya to control TSSM. Two rates of Bio-pesticides were tested in nursery, vegetative and fruiting stages in a randomized complete block design. Results showed that the average percentage mortality of TSSM at day after each application of Hort-Impact was 95.4 for both concentrations. M-Impact resulted an average mortality of 98.7% and 97.9% for 1.0 mLL-1 and 0.5 mLL-1, concentrations respectively during the vegetative stage at Meepilimana. However, at Radella, during the nursery stage, average mortalities were 98.4% and 98.3% for 1.0 mLL-1 concentration and 95.8% and 97.7% for 0.5 mLL-1 concentration for Hort-impact and M-impact, respectively. The DOA recommended insecticide Abamectin at 1.0 mLL-1 concentration resulted a mean TSSM count >200 at the end of the experiment and was significantly higher than Hort-Impact and M-Impact treatments. The TSSM counts were 52 and 45 and 80 and 36 for concentrations 1.0 mLL-1 and 0.5 mLL-1 respectively at Meepilimana and a similar trend was observed at Radella. It is therefore concluded that both Bio-pesticides at both concentrations were effective in controlling TSSM in strawberry. However, M-Impact cannot be used at fruiting stage as it imparts a bitter taste for the fruits at Welimada site.
How to Cite: Perera, M.T.M.D.R., Senanayke, N. and Perera, C., 2022. Bio-pesticides for the Control of Two–spotted Spider Mite, Tetranychus urticae Koch, in Strawberry Cultivations. Sri Lankan Journal of Agriculture and Ecosystems, 4(1), pp.137–148. DOI: http://doi.org/10.4038/sljae.v4i1.88
14
Downloads
Published on 07 Jul 2022.
Peer Reviewed

Downloads

  • PDF (EN)

    comments powered by Disqus