📌 Quick Summary (TL;DR): Pests on Fruiting Strawberries
- 🍓 The Panic: Discovering thrips or weevils when your strawberries are already blooming or fruiting is a nightmare. Heavy chemical pesticides are strictly off-limits right now.
- 🛑 The “Wait it Out” Camp: Many traditional growers advise against spraying anything during fruiting, especially if kids eat straight from the patch. They wait until the harvest is over (July) to aggressively treat the plants.
- 🛡️ The “Organic Suppression” Camp: Other growers use organic, short-acting bio-insecticides (like Spinosad) to “knock back” the thrips. It won’t eradicate them completely, but it saves the current crop.
- 🔍 Misdiagnosis Warning: Are you sure it’s bugs? If your berries are drying up and turning brown, it might not be thrips at all. It could be a fungal disease like Leather Rot or Dry Rot. Always verify before spraying!
🌍 You’re reading a translated thread from our Russian-language forum. These growers garden in climates very similar to Minnesota, Wisconsin, Maine, and Ontario (short summers, late frosts, and cold soil).
Have a different pest-control strategy in your state or province? Drop a comment below! We’d love to compare notes.
Help! Is it too late to spray my berries?
Hi everyone! I need help. I just noticed thrips on my strawberries, and the berries are already forming! What do I do? The berries are drying up; I’ve already thrown a couple away without even getting to eat them. 😭
To make matters worse, strawberry weevils (clippers) are crawling all over the patch. It’s a nightmare. The currants are covered in aphids, and I’m scared to spray the raspberries because they are blooming right now and I don’t want to hurt the pollinators.
This is what happens when you skip your spring preventative spraying… 🤦♀️🍓
Katya, it is too late to spray the strawberries now. You just have to wait until July, when you have harvested all the berries, and then treat them heavily. You can still spray the raspberries, though, if you do it carefully. 🚫🍓
Aleksan9ra (Ludmila) wrote:
Katya, it is too late to spray the strawberries now. You just have to wait until July…
Luda, I have to disagree. I would spray them right now with a biological insecticide (like Fitoverm).
I don’t think Katya’s strawberries are fully red and harvesting continuously yet. Down south in my garden, only one variety has ripe red berries. The rest are still mostly green and blooming. You have to spray and save the crop! 🛡️
Natasha, a mild biological spray won’t do anything against strawberry weevils—you had to spray for those early in the spring, like you’re supposed to. And as for thrips, you need a minimum of 3 consecutive treatments to get rid of them. That’s exactly why I said it’s too late!
If she sprays them now, it won’t work, and she’ll just be doubly disappointed. My berries are ripening, and I’m picking a few every day. I wouldn’t dare spray them right now, especially if little kids are running around the garden looking for fresh berries to eat. 🧒🍓
Aleksan9ra (Ludmila) wrote:
And as for thrips, you need a minimum of 3 consecutive treatments…
It will still suppress the thrips! Even a single spray of a biological insecticide right now will knock their numbers back. It won’t eradicate them completely, but it will give the plants a fighting chance so you can at least harvest *something*.
It’s strange this year, my early, mid, and late varieties are all progressing at the exact same pace. The bushes are massive, some have up to 15 flower stalks, with a mix of white berries, green berries, and flowers all at once.
Well, let Katya decide for herself.
But honestly, maybe it isn’t even thrips? Since she mentioned the berries are drying up, could it be Dry Rot (a fungal issue)? I really wish we could see a picture before we give her advice on spraying! 🔍
I’ve noticed a lot of strange things in the garden this year that I can’t explain. Oh well, as long as we get berries. The forecast looks good for them: sun and heat.
There is a massive debate in this thread about spraying strawberries while fruit is present. Here is what you need to know:
- The Insecticide Used: Natalia suggests Fitoverm, a highly popular organic pesticide in Eastern Europe based on Avermectin. In the US, the closest equivalent organic spray for thrips is Spinosad (found in brands like Captain Jack’s Dead Bug Brew) or Pyrethrin.
- Safety and PHI: Ludmila is worried about kids eating the berries. When using any spray (even organic Spinosad), you must check the label for the PHI (Pre-Harvest Interval). This tells you exactly how many days you must wait between spraying and eating the fruit. For Spinosad on strawberries, the PHI is usually 1 day, making it safe for mid-harvest suppression if washed properly.
- The Misdiagnosis: Ludmila makes a brilliant point at the end. Thrips usually cause the strawberry blossoms to drop or the fruit to turn bronzed and cracked. If the fruit is turning brown, leathery, and drying up entirely, it is often Leather Rot or another fungal disease, not an insect!
