Why is it a problem?
Liriomyza trifolii is a major pest of ornamental and vegetable crops. It has caused considerable crop losses and loss of overseas markets due to quarantine requirements in parts of East Africa.
- Loss of crops
- Kills host plant
- Negatively impacts livelihoods
What’s the solution?
Research has shown that yellow sticky traps (YSTs) were the most effective colour traps, in attracting adult leafminers. The study showed that the average percentage of damaged leaves and damage severity was significantly lower in fields with YTSs, 50 days after they had been introduced.
Some insecticides can be used to control Liriomyza trifolii, to varying effectiveness. Studies have shown that the leafminer can develop resistance to an insecticide within 2-4 years. Effective control by using insecticides can be achieved through rotating the type used and modes of action.
Natural enemies periodically suppress leaf-miner populations. Parasitoids, and to a lesser extent to nematodes, bacteria and fungi, are used for biological control of leafminers. Extensive global research has reported more than 150 species of parasitoids associated with Liriomyza trifolii. Of these, Neochrysocharis formosa was indicated as being the most promising biocontrol agent.