Nature of Destruction
Destroyed by absorbing the water at the top of the leaf, causing the leaf to curl, wrap and not sprout. Found a lot in midday. Tiny, slender and brown. Mostly living under the leaf. Dehydration may lead to plant death if it is not treated.
- In the summer, sprinkler watering in the field can assist to reduce the number of thrips
- The use of sticky traps aids in thrip population reduction. Using A4 plastic, cover the marigold with sticky glue. About 60–80 traps are used per rai ( 1600 square meters)
- To reduce the use of chemicals, choose to use Beaveria fungi instead if there are fewer than 10 thrips per marigold plant.
- Chemicals must be applied as follows if the procedures listed above are unable to control the outbreak:
– Abamektin 20 cc per 20 litres of water
– Funobucarb 50 cc per 20 lites of water
– Malathyone 20-30 cc per 20 litres of water
– Fenitothyone 10-20 cc per 20 litres of water
Protection and Control
- Always explore the top of the marigold, to detect the outbreak of Moina.
- Cut off any leaves that are inhabited by Moina and burn out to destroy to reduce the population of Moina.
- If the outbreak of Moina cant be controlled. Use chemicals to control and eliminate as follows:
– Emitrash 30 ccs per 20 litres of water
– Dicofol 20- 30 grams per 20 litres of water
Information from :
pirun.kps.ku.ac.th
http://www.thongchaloem.com
http://www.marigoldthai.com
http://agritech.tnau.ac.in/horticulture/
http://www.ppsf.doae.go.th/pest_and_drought/marigold.html