5

I noticed these sugary white granules on my tomato leaves a couple of months ago, and saw some insects which I thought were aphids but didn't look closely. Now it looks as though my potatoes are infected.

The tomato potato psyllid (TPP) arrived in this country in 2006, presumably from the USA, and I was quite unfamiliar with it. I suspect that this is my problem.

Sugar granules on tomato leaf

sugar granules on leaf

Nymphs and winged adults

young and older psyllids

Tomato caterpillar lying amongst psyllid sugar sugar and caterpillar

Potato leaf curl

potato leaf infected with psyllid

I'm going to remove and bag up the infected plants, but a couple of weeks ago before I realized what was wrong I pulled the spuds out and put them into the compost.

Do I need to remove them from the compost pile or is it too late? And should I remove all guest potato plants from the garden, infected or not?

3

Is this the tomato potato psyllid?

Those green bugs are not "The tomato potato psyllid (TPP)" but they are definitely some kind of green psyllids (maybe boxwood psyllids).

Do I need to remove the [infected spuds] from the compost pile or is it too late?

Psyllids can travel, but I don't think you have an invasive species... so strict quarantining might not be necessary. As for the compost, if you bury the potatoes (and plants) under a foot (or two) of compost, that should smother the bugs.

And should I remove all guest potato plants from the garden, infected or not?

If cultural and chemical controls aren't working (well), then I would bag them. Generally, neem oil and spinosad work on psyllids.

  • The adult TPP (Bactericera cockerelli) is supposed to resemble a miniature cicada which these don't. But I found it attacking all the same targets viz: tomato, potatoes, deadly nightshade, egg plants. And the tomato leaves were also yellowing. But I suspect you're correct. – Graham Chiu Jul 7 '16 at 5:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.