What's this infestation? On Thornless Honeylocust - Gleditsia triacanthos var. inermis.

[Low Altitude]

The Bifenthrin counterattack on the invasion of thrips and spider mites is underway. I have now applied one dose to all the affected houseplants, plus, 'prophylactically', to others, on the presumption that they are vulnerable to infection. FWIW I have mostly applied the Bifen by immersion of potted plants, and at a concentration of 0.04%.

Let's see what happens.

How long should i wait until giving a second dose? Once every few waterings? Once or twice a year (growing season)?

 

[Chuck]

The Bifenthrin counterattack on the invasion of thrips and spider mites is underway. I have now applied one dose to all the affected houseplants, plus, 'prophylactically', to others, on the presumption that they are vulnerable to infection. FWIW I have mostly applied the Bifen by immersion of potted plants, and at a concentration of 0.04%.

Let's see what happens.

How long should i wait until giving a second dose? Once every few waterings? Once or twice a year (growing season)?

I would do it once every 7 - 10 days in order to disrupt their reproductive cycle and keep doing it until there is zero sign of them and then every couple of months prophylactically.

 

[Low Altitude]

Oh that's good to know, Chuck, thanks. In my ignorance, i was afraid of overdoing it, and damaging the plants. 70-10 days will be a handy alternate watering for most of them, then with a 1-in-4 after the bugs seem gone. Many thanks.