Abstract
Mites are considered as seasonal pests in tea. They cause significant damage to the crop during dry weather. However, the restrictions imposed by tea importers on pesticide residues in made tea pose an immediate need to identify alternative control methods for Propargite (a synthetic acaricide) and sulphur which are the current recommendations. The alternative methods should be effective, biological, safe and acceptable to the importers. Previous attempts have been made to screen predatory mites and entomopathogenic fungi against tea mites; however, local sources have not yet been investigated. The present study was conducted to explore the possibilities in biological control methods with specific objectives of isolating and preliminary screening of local entomopathogenic fungi against tea mites under laboratory conditions. In this study, naturally occurring fungal species from six different tea ecosystems reducing populations of tea red spider mites (Oligonychus coffeae) were isolated. The laboratory experiments conducted on mite-infested excised-leaves confirmed that the unidentified fungus coded as HF1 was significantly (p<0.05) effective in reducing mite populations. The Fungal isolate gave 65% mortality while the highest mortality of 75% was achieved by the TRI recommended acaricide, Propargite. Comparatively, H. thompsonii and neem seed extract exhibited lower mortality. This is the first record of isolation of entomopathogenic fungi from tea mites in Sri Lanka. The preliminary results foresee the potential of harnessing local entomopathogenic fungi in managing tea mites as an environmentally safe and effective treatment.Key words: Entomopathogenic fungi; Hirsutella thompsonii; Red spider mitesDOI: http://dx.doi.org/10.4038/tar.v22i4.3789TAR 2011; 22(4): 384-391
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Claims 8
Claim · model-written summary
Six tea ecosystems yielded fungi associated with reduced tea mite populations.
- Taxon
- teae0
- Interactor
- Oligonychus coffeaeOligonychus coffeaee0pest
- Outcome
- reducing populations of tea red spider mites (Oligonychus coffeae)e0
- Setting
- six different tea ecosystemse0
Verbatim
e0“naturally occurring fungal species from six different tea ecosystems reducing populations of tea red spider mites (Oligonychus coffeae) were isolated”
Claim · model-written summary
Fungus HF1 significantly reduced mite populations on infested tea leaves.
- Taxon
- Teat0
- Treatment
- unidentified fungus coded as HF1e0
- Interactor
- Oligonychus coffeaeOligonychus coffeaet0pest
- Second interactor
- HF1Haloferacalesvirus HF1e0biocontrol_agent
- Outcome
- reducing mite populationse0
- Direction
- reducinge0
- Setting
- laboratorye0
Not reportedComparator
Verbatim
e0“The laboratory experiments conducted on mite-infested excised-leaves confirmed that the unidentified fungus coded as HF1 was significantly (p<0.05) effective in reducing mite populations.”
t0“Tea Red Spider Mites (Oligonychus coffeae”
Claim · model-written summary
HF1 caused 65% mite mortality.
- Taxon
- Teat0
- Treatment
- Fungal isolatee0
- Interactor
- Oligonychus coffeaeOligonychus coffeaet0pest
- Outcome
- mortalitye0
- Value
- 65%e0
- Comparator
- Propargitee0
Not reportedDirection
Verbatim
e0“The Fungal isolate gave 65% mortality while the highest mortality of 75% was achieved by the TRI recommended acaricide, Propargite.”
t0“Tea Red Spider Mites (Oligonychus coffeae”
Claim · model-written summary
Propargite produced 75% mite mortality.
Verbatim
e0“The Fungal isolate gave 65% mortality while the highest mortality of 75% was achieved by the TRI recommended acaricide, Propargite.”
t0“Tea Red Spider Mites (Oligonychus coffeae”
Claim · model-written summary
H. thompsonii produced lower mite mortality.
- Taxon
- Teat0
- Treatment
- H. thompsoniie0
- Interactor
- Oligonychus coffeaeOligonychus coffeaet0pest
- Second interactor
- H. thompsoniiHirsutella thompsoniie0biocontrol_agent
- Outcome
- mortalitye0
- Direction
- lowere0
Not reportedComparator
Verbatim
e0“Comparatively, H. thompsonii and neem seed extract exhibited lower mortality.”
t0“Tea Red Spider Mites (Oligonychus coffeae”
Claim · model-written summary
Neem seed extract produced lower mite mortality.
- Taxon
- Teat0
- Treatment
- neem seed extracte0
- Interactor
- Oligonychus coffeaeOligonychus coffeaet0pest
- Outcome
- mortalitye0
- Direction
- lowere0
Not reportedComparator
Verbatim
e0“Comparatively, H. thompsonii and neem seed extract exhibited lower mortality.”
t0“Tea Red Spider Mites (Oligonychus coffeae”
Claim · model-written summary
The authors report the first isolation of entomopathogenic fungi from tea mites in Sri Lanka.
Verbatim
e0“This is the first record of isolation of entomopathogenic fungi from tea mites in Sri Lanka.”
Claim · model-written summary
Local entomopathogenic fungi were proposed for environmentally safe tea mite management.
Verbatim
e0“The preliminary results foresee the potential of harnessing local entomopathogenic fungi in managing tea mites as an environmentally safe and effective treatment.”
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See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.