bonsai general - 20 views
Thrips are some of the most difficult to see insects, however, the damage they cause is easy to detect. I have seen the great occasionally, but more often they are small – less than 1 mm. scratch leaves and suck the sap, leaving the silvery green foliage. Black or brown dots mark their droppings.
healthy foliage with Pieris Pieris badly damaged foliage
Yes, the contrast between healthy foliage and thrips-damaged foliage, is the largest.
Thrips damaged foliage
damage thrips is often so identifiable from the underside of the leaves.
damage thrips from below
they can do a lot of damage in a short period of time so it is important to note any adverse activity in bonsai foliage.
What variety of bonsai is what I like? I do not know if it is your absolute favorite, but azaleas and rhododendrons are good candidates.
thrips damage in the azalea
tend to treat infestations with the usual regimen – oils, soaps, contact and systemic pesticides – even when spraying I am very careful to completely coat the upper and lower leaf surfaces. My goal is to do this every time I’m spraying, but do additional insurance to cover all surfaces in the fight against thrips because they often feed on the undersides of leaves.
Because damaged leaves no “cure” after the bugs are gone, it can be difficult to ensure that the infestation is under control. Tracking applications and constant vigilance are the best alternative to keep thrips under control.
This article was originally published on bonsaitonight.com