Abstract
Tetranychus marianae McGregor (Acari: Tetranychidae) is a pest of several perennial crops and is widespread in the Pacific Basin, including the Mariana Islands where it was first reported. The mite is also present in the West Indies, Bahamas, southern USA, Nicaragua, Argentina, Brazil and Southeast Asia. Eggplant growers apply carbaryl 10 to 15 times against this pest during each cropping period. Some growers no longer cultivate eggplant and tomato because of uncontrollable mite infestations. Previous indoor studies have shown petroleum spray oil (PSO) to be effective against T. marianae. We therefore examined the comparative effectiveness of PSO (Sun-spray 6E®) at the rate of 5mL/liter, and carbaryl at the rate of 1.5 mL/liter, against T. marianae on eggplant at 2 locations in Guam. The mean percentages of mite infested leaves and the population densities of T. marianae at both the locations were significantly higher in control plots than in treatment plots. PSO treatments with 6 and 15 sprays more effectively reduced the number of T. marianae-infested leaves and populations of T. marianae than carbaryl treatments. Marketable yields of eggplant from PSO treated plots were significantly higher than from the other plots. We recommend 6 applications of PSO at 15, 25, 35, 45, 55 and 65 days of after transplanting for managing T. marianae on eggplant.
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Claims 6
Claim · model-written summary
Treatment plots had fewer mite-infested leaves than controls.
- Taxon
- eggplant
Solanum melongenae1 - Treatment
- treatment plotse0
- Interactor
- T. marianaeTetranychus marianaee0pest
- Outcome
- mite infested leavese0
- Direction
- highere0
- Comparator
- control plotse0
- Setting
- Guame1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean percentages of mite infested leaves and the population densities of T. marianae at both the locations were significantly higher in control plots than in treatment plots.”
e1“on eggplant at 2 locations in Guam”
Claim · model-written summary
Mite population densities were lower in treatment plots than controls.
- Taxon
- eggplantSolanum melongenae1
- Treatment
- treatment plotse0
- Interactor
- T. marianaeTetranychus marianaee0pest
- Outcome
- population densities of T. marianaee0
- Direction
- highere0
- Comparator
- control plotse0
- Setting
- Guame1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean percentages of mite infested leaves and the population densities of T. marianae at both the locations were significantly higher in control plots than in treatment plots.”
e1“on eggplant at 2 locations in Guam”
Claim · model-written summary
Six PSO sprays reduced mite-infested leaves and mite populations more than carbaryl.
- Taxon
- eggplantSolanum melongenae1
- Treatment
- PSO treatments with 6e0
- Interactor
- T. marianaeTetranychus marianaee0pest
- Outcome
- number of T. marianae-infested leaves and populations of T. marianaee0
- Direction
- reducede0
- Comparator
- carbaryl treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSO treatments with 6 and 15 sprays more effectively reduced the number of T. marianae-infested leaves and populations of T. marianae than carbaryl treatments.”
e1“on eggplant at 2 locations in Guam”
Claim · model-written summary
Fifteen PSO sprays reduced mite-infested leaves and mite populations more than carbaryl.
- Taxon
- eggplantSolanum melongenae1
- Treatment
- 15 sprayse0
- Interactor
- T. marianaeTetranychus marianaee0pest
- Outcome
- number of T. marianae-infested leaves and populations of T. marianaee0
- Direction
- reducede0
- Comparator
- carbaryl treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSO treatments with 6 and 15 sprays more effectively reduced the number of T. marianae-infested leaves and populations of T. marianae than carbaryl treatments.”
e1“on eggplant at 2 locations in Guam”
Claim · model-written summary
PSO plots had significantly higher marketable eggplant yield than other plots.
- Taxon
- eggplantSolanum melongenae0
- Treatment
- PSO treated plotse0
- Outcome
- Marketable yields of eggplante0
- Direction
- highere0
- Comparator
- other plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marketable yields of eggplant from PSO treated plots were significantly higher than from the other plots.”
Claim · model-written summary
The authors recommend six timed PSO applications to manage T. marianae on eggplant.
- Taxon
- eggplantSolanum melongenae0
- Interactor
- T. marianaeTetranychus marianaee0pest
- Outcome
- 6 applications of PSO at 15, 25, 35, 45, 55 and 65 days of after transplantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We recommend 6 applications of PSO at 15, 25, 35, 45, 55 and 65 days of after transplanting for managing T. marianae on eggplant.”
The same questions in other papers
application · quality: postharvest · Solanum melongena (eggplant)Positive and negative results
7 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
5 papers more in this group
See all 9 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.