UC Rice Blog

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K def leaf
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Potassium deficiency

August 7, 2025
By Luis A Espino, Sarah Marsh Janish
We have posted about potassium deficiency before, but we have gotten a couple of calls and messages about this recently. When potassium is deficient, leaves start showing reddish spots on the tips. These spots can be somewhat elongated and give the impression of a narrow lesion. The lesions appear late…
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rice field with bakanae
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2025 Pest Issues Update

August 6, 2025
By Luis A Espino
I have seen several issues with arthropods and diseases so far this year. Here’s a quick rundown:  Bakanae: Like in previous years, there have been several fields with heavy Bakanae infections. While the number of plants infected is high, I don’t think any of those fields are going to experience a…
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blackbirds in rice field
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Blackbird Damage

August 4, 2025
By Sarah Marsh Janish
 Recently, I have been getting questions about possible bird damage in early-heading rice fields. Blackbirds, primarily red-winged blackbirds, can damage rice from planting season, seedling stage, and the ripening period; however, in California, where the majority of our rice is water-seeded, typically…
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Blast
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Fungicide: to treat or not to treat?

July 29, 2025
By Luis A Espino
This is a question I have gotten several times in the past few days. As rice starts heading, and given that the price of rice is bad, can we cut the fungicide? The main reason to use a fungicide is to prevent diseases. The main disease we are worried about is blast. Blast can be devastating. However, we…
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