Abstract
Huanglongbing (HLB) or citrus greening disease is vectored by the Asian citrus psyllid (ACP), Diaphorina citri Kuwayama. Vector control is considered a basic component of HLB management even in a high disease incidence scenario. Such control is mostly chemically oriented. However, overuse of insecticides would increase costs and be incompatible with biological control. Establishment of economic thresholds for psyllid control under different price scenarios would optimize returns on investment. A 3-year experiment is being conducted in a commercial orange block with high HLB incidence. Experimental design is RCB with 4 treatments and 4 replicates: (1) calendar applications, (2) insecticide applications according to a threshold of 0.2 psyllids/stem tap sample, (3) applications according to a 0.7 threshold and (4) no insecticide. Vector populations are monitored biweekly by tap sampling. Differences in vector abundance among treatments are being correlated to fruit yields. Consequences of each vector control strategy on beneficial arthropod fauna are also being evaluated, as well as potential negative impacts on biological control. After two years, a significant yield increase was observed with the calendar treatment, but so far, justification for the additional costs would require higher than actual juice prices scenarios. ACP management strategies based on nominal thresholds are so far more profitable. Negative impacts of calendar sprays on biological control of mites and leafminers have been observed.
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Claims 3
Claim · model-written summary
Calendar insecticide applications significantly increased orange yield after two years.
Not reportedComparator
Verbatim
e0“After two years, a significant yield increase was observed with the calendar treatment”
e1“commercial orange block with high HLB incidence”
Claim · model-written summary
Nominal psyllid thresholds were more profitable than calendar applications.
Verbatim
e0“ACP management strategies based on nominal thresholds are so far more profitable”
e1“commercial orange block with high HLB incidence”
Claim · model-written summary
Calendar sprays negatively affected biological control of mites and leafminers.
- Taxon
- orangee1
- Treatment
- calendar sprayse0
- Interactor
- mitese0pest
- Second interactor
- leafminersAgromyzidaee0pest
- Outcome
- biological control of mites and leafminerse0
- Direction
- Negative impactse0
Not reportedComparator
Verbatim
e0“Negative impacts of calendar sprays on biological control of mites and leafminers have been observed”
e1“commercial orange block with high HLB incidence”
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application · pest · Citrus sinensis (sweet orange)Positive and negative results
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See all 6 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.