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All my orchids(not just dendrobiums) are outside and unprotected, either in the ground or in hanging baskets and they were all attacked by the Beetle, to the extent they were bare sticks and hadn’t flowered for several years. For the past two months, I have been spraying them every two weeks with a Carbaryl solution of 3ml to 500ml water. I give them a good drenching, especially on the stems where the new leaves connect. They are all miraculously coming back, new growth and flowers everywhere. I initially tried spraying once a month with 5ml/500ml but the new growth was still being destroyed so weakened the solution and every two weeks is working beautifully.
The rotten little suckers will even find their way into a bush house . I know . If someone has a secret deterrent then I would love to hear or see it . Has anyone tried neem oil ? I worry that these sprays will damage the plants .
I have recently found the odd 1 sucking and nibbling on my long awaited flowering . Such a huge disappointment .
These Beetles just wait for new growth and particularly the annual flowering sprout on my Cooktown orchid.I wait all year to see these beautiful flowers only to have them eaten by this rotten Beetle. How they know ,is beyond me but by the time you spray your orchid these guy s have already done the damage. They must use scent to detect new growth. Maybe some smelly deterant is the fix.
Maybe condsider trying yellow or blue sticky traps next to plants.
Speciosum blooms are YELLOW!
Fill any large container depending on the size of your plants with bigger specimens a wheel barrow works with water dunk plants until they surface then you know what to do throw in some fertiliser if you want and you have killed 2 birds with 1 stone