From the Viette's Views Gardening Blog
Our bell peppers provided some of the strangest looking fruits in our garden this year. From the top (at the stem end), they looked fairly normal but at the blossom end, the skin was light brown, rough, and hard. In many cases, the whole bottom half of the pepper was like this. I knew it wasn’t blossom end rot because the flesh wasn’t really damaged – it was quite superficial. I had never seen anything like it before.
I thought perhaps it was environmental or maybe a mosaic virus but nothing really fit. Then I wondered if it had something to do with the herbicide drift that injured our tomato plants back in the early summer but the descriptions of herbicide damage to peppers didn’t really match what was going on with our peppers.
Finally, after reviewing photos of pests and diseases of sweet peppers, I found the answer – cyclamen mites! I never would have thought that this was an insect problem. Well, actually, mites aren’t insects but you know what I mean.
Cyclamen mites (Phytonemus pallidus) are tiny mites that attack many different plants including peppers and tomatoes. As these little pests feed, they inject chemicals into the plant tissue. These chemicals act as growth regulators and cause abnormalities in the foliage and fruit.
Feeding in the foliage causes crinkling and twisting of the leaves and sometimes leads to the formation of larger than normal leaves. I wish I had taken a picture of the foliage because that was another thing I noticed about these pepper plants; their leaves were huge and puckered.
When cyclamen mites feed on the developing fruit, their salivary secretions cause the skin of the fruit to become tough and russeted. This tan, rough skin was very obvious and fairly extensive on many of our peppers. It mostly occurred at the blossom end and seemed to restrict the normal growth/expansion of the fruit – almost like the pepper was constricted by tight netting.
Though the russeting is superficial, it essentially ruins the part of the fruit that it covers. I did peel some of the tough skin off one of my peppers and tasted it to see if the flavor was affected. I thought it tasted a bit weird but that could have been all in my head. Still, I ended up composting the majority of the defective portions.
University of Maryland Extension says that cyclamen mites can be a “minor pest of pepper and tomato”. When we lost so many peppers this year, it didn’t seem like a minor problem to me!
I’m sure what they meant is that they aren’t common pests of peppers in the vegetable garden. Apparently, these pests are more common in greenhouse situations. We did purchase a few of our pepper plants from a greenhouse so perhaps we introduced them to the garden that way.
If you notice the damage early on (and recognize it as mite damage), you can control cyclamen mites with a miticide such as Bonide Mite-X and still have a good harvest later in the season.