Claim · model-written summary
With 30 prey females available, raising the predator:prey ratio from 1:30 to 9:30 made the predator population increase faster.
- Treatment
- predator:prey ratio increased from 1:30 to 9:30e7
- Outcome
- predator populatione7
- Direction
- increased fastere7
- Qualifier
- fixed number of prey (30 females)e7
- Comparator
- 1:30e7
CitrusNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a pest of citrus in Fujian Province, China”
e7“When a fixed number of prey (30 females) was available, the predator population increased faster and reduced prey populations faster when predator:prey ratio increased from 1:30 to 9:30”
Title
Y. X. Zhang; Z. Q. Zhang; C. P. Chen; et al. Systematic and Applied Acarology 2001. doi:10.11158/saa.6.1.6
Other claims from this paper (12)
- Observation Amblyseius cucumeris completed development from egg to adult in about a week at 24-28°C when fed Panonychus citri on citrus.
- Intervention effect Females of A. cucumeris fed on prey eggs more than on other prey stages.
- Observation Females of A. cucumeris produced 2-3 eggs per day, with a maximum of 4.
- Association The number of Panonychus citri females consumed by A. cucumeris increased significantly with the number of prey females per leaf.
- Association The number of eggs produced by A. cucumeris females increased significantly with the number of prey females per leaf.
- Association The number of eggs produced showed a positive linear relationship with the number of prey consumed.
- Observation When fewer than 5 prey females were present per leaf, most (86%) A. cucumeris females did not lay any eggs.
- Intervention effect With 30 prey females available, raising the predator:prey ratio from 1:30 to 9:30 made prey populations decrease faster.
- Intervention effect Releases of predator females at predator:prey ratios as low as 1:54-58 provided control of the citrus mite within five weeks on potted citrus seedlings.
- Intervention effect A single preventive release of A. cucumeris with a controlled release system gave adequate control of citrus red mite in field trials.
- Intervention effect A single preventive release of A. cucumeris in field trials significantly reduced the rate of black fruits on citrus.
- Intervention effect Biological control with A. cucumeris cost one-third less than conventional chemical control.