![welcome to the rice fields welcome to the rice fields](https://i.kym-cdn.com/photos/images/original/002/034/222/7f7.jpg)
SuperWham®, Regiment®, and Clincher® controlled 10 of 10 samples (at least 50% control). 9 of the 10 samples were not controlled by Bolero®, and 6 of the 10 were not controlled by Cerano®.
![welcome to the rice fields welcome to the rice fields](https://pics.awwmemes.com/welcome-to-the-rice-fields-motherfucker-i-see-this-as-57922444.png)
Trade Nameġ0 of the 10 unknown watergrass samples were not controlled at 14 Days After Treatment (DAT) (less than 50% by biomass, in comparison to the untreated controls) by Granite GR® or Butte® (Table 2). Herbicides and rates utilized for 2020 watergrass screening. In 2018, 10 more fields were identified, and samples were collected and screened for herbicide susceptibility in 2020. After extensive attempts at identification at both the UC Davis Herbarium, and even with the assistance of two Echinochloa experts at two other universities, we were unable to conclusively identify the species.
![welcome to the rice fields welcome to the rice fields](https://i.ytimg.com/vi/SI6OyP7sK_8/maxresdefault.jpg)
The lack of control was coupled with outward characteristics that were not immediately identifiable to one of the known species. Both fields had extensive infestations, which were uncontrolled by repeated herbicide applications. In 2017, two rice fields were identified with an unknown watergrass biotype (or species) that looked very different than the three main known species that infest California rice fields (late watergrass, early watergrass, and barnyardgrass). For early watergrass, we now have resistant biotypes (to thiobencarb), with none recorded as being multiple-herbicide resistant. We know that as of the early 2000s, we had found multiple-herbicide resistant late watergrass (also known as mimic), as well as multiple-herbicide resistant barnyardgrass. We are having more and more difficulties controlling watergrass over the past 20 or so years.