Yellow Nutsedge Trial, 2007

The objective of this study was to observe the effectiveness of several yellow nutsedge (Cyperus esculentus) controls. It was conducted at the Iowa State University turf grass research area in a non-irrigated turf with a high population of yellow nutsedge plants. The treatments are listed in Table 1

Field Evaluation of Herbicides on Small Fruit, Vegetable, and Ornamental Crops, 1997

Growers generally use herbicides to efficiently produce high-quality fruit and vegetables for processing or fresh market sales. Due to the smaller acreage of these crops compared to major field crops, fewer herbicides are registered for use in fruit and vegetable crops than for field crops. Each year, new herbicides are evaluated under Arkansas growing conditions with the objective of improving the herbicide technology for the grower, processor, and ultimately the consumer. This report includes studies on the control of many of the more serious weed problems in important crops of this region, including snapbeans, spinach, southern pea, watermelon, cantaloupe, tomato, blackberry, and grape. In addition, the report includes information on the tolerance of selected bedding plants to some effective herbicides

Yellow Nutsedge Trial

The objective of this study was to observe the effectiveness of several yellow nutsedge (Cyperus esculentus L.) controls

Hyperspectral classification of Cyperus esculentus clones and morphologically similar weeds

Cyperus esculentus (yellow nutsedge) is one of the world's worst weeds as it can cause great damage to crops and crop production. To eradicate C. esculentus, early detection is key-a challenging task as it is often confused with other Cyperaceae and displays wide genetic variability. In this study, the objective was to classify C. esculentus clones and morphologically similar weeds. Hyperspectral reflectance between 500 and 800 nm was tested as a measure to discriminate between (I) C. esculentus and morphologically similar Cyperaceae weeds, and between (II) different clonal populations of C. esculentus using three classification models: random forest (RF), regularized logistic regression (RLR) and partial least squares-discriminant analysis (PLS-DA). RLR performed better than RF and PLS-DA, and was able to adequately classify the samples. The possibility of creating an affordable multispectral sensing tool, for precise in-field recognition of C. esculentus plants based on fewer spectral bands, was tested. Results of this study were compared against simulated results from a commercially available multispectral camera with four spectral bands. The model created with customized bands performed almost equally well as the original PLS-DA or RLR model, and much better than the model describing multispectral image data from a commercially available camera. These results open up the opportunity to develop a dedicated robust tool for C. esculentus recognition based on four spectral bands and an appropriate classification model

Ethnobotanical study of cultivated yellow nutsedge, (Cyperus esculentus L.) in Burkina Faso

The yellow nutsedge, Cyperus esculentus L. is an herbaceous species whose tubers are the edible parts. The tubers are very popular with children, and can be eaten raw, fried or after processing into a drink (Horchata). However, it does not exist in Burkina, a centralized collection and studies on the genetic variability, the socio-cultural and economic aspects of this species. In order to identify the morphotypes and to welcome the peasant knowledge on the management of the, yellow nutsedge, a prospection followed by collection of tubers were carried out in the main areas of production of this crop. A total of 22 villages in eight districts were visited and 108 accessions of tubers were collected. It emerges from this study that the cultivation is mainly practiced by women (97% of farmers). The cultivated yellow nutsedge is adapted to drought and to several types of soil. In addition, farmers classify the tubers according to their shape and size. Thus, the spherical tubers are qualified as "small tubers the non-spherical tubers as" large tubers. The number of tubers produced per foot varies from 20 to 60. Farmers use phenotypic characters, sexual dimorphism and ethnicity to name accessions for sweet peas. Vernacular names and methods of producing yellow nutsedge vary by region and ethnicity. According to the respondents, 84.34% think that the nut is of Burkinabé origin, 9.26% Ghanaian, 1.85% from Mali and 5.35% have no answers. There is great diversity in local knowledge and accessions collected in Burkina.Keywords: Ethnobotany, tubers, accessions, morphotypes

Horticultural Studies 1998

Horticulture connects with people in many ways including an enhanced awareness concerning the importance of fruits and vegetables in our diet. The health benefits of such a diet is gaining wide recognition throughout the public and will likely provide tremendous opportunities for research, education and business development. Significant faculty additions and programmatic efforts were made to the university’s fruit and vegetable programs in 1998

Activity of benzobicyclon herbicide in common Louisiana rice production practices

A study was conducted at the LSU AgCenter H. Rouse Caffey Rice Research Station (RRS) to evaluate benzobicyclon herbicide application timing on water-seeded rice. Benzobicyclon was applied at seven different timings, at 246 g ai ha-1 in a water-seeded rice production system. Benzobicyclon controlled ducksalad above 90% when applied into the pinpoint flood. Barnyardgrass control was greater than 90% from applications made on pegging rice and immediately following pinpoint flood establishment. At 49 days after treatment (DAT), yellow nutsedge control exceeded 90% following benzobicyclon treatment with a pegging rice or pinpoint flood timing. Ducksalad control was greater than 90% following application into the pinpoint flood. A study was conducted at the RRS and LSU AgCenter Northeast Research Station (NERS) to evaluate nine different rates of benzobicyclon on weeds common to Louisiana rice production. Benzobicyclon was applied at 0, 31, 62, 123, 185, 246, 493, 739, 986, and 1232 g ha-1. Barnyardgrass, yellow nutsedge, and false pimpernel did not exceed 50% control, regardless of benzobicyclon rate. At 42 DAT, benzobicyclon applied at 185 and 246 h ha-1 controlled purple ammannia and Indian toothcup, respectively, and this control was similar to control observed with 986 to 1232 g ha-1 of benzobicyclon. At the conclusion of the study, no differences in fresh weight biomass occurred for barnyardgrass, yellow nutsedge, purple ammannia, or false pimpernel. Benzobicyclon applied at 246 g ha-1 reduced ducksalad and Indian toothcup biomass 87 and 77%, respectively. A glasshouse study was conducted at the LSU campus in Baton Rouge to evaluate five rates of benzobicyclon applied into a 5- or 10-cm flood. Benzobicyclon applied at 246 g ha-1, in either flood depth, reduced yellow nutsedge tuber development and growth. Tuber production is the primary means of yellow nutsedge reproduction in the southern US, and use of this herbicide could impact future nutsedge populations. A field study was conducted to evaluate benzobicyclon in mixture with imazethapyr or imazamox in imidazolinone-resistant rice. The addition of benzobicyclon increased activity on hemp sesbania over imazethapyr or imazamox; however, hemp sesbania control did not exceed 30% when treated with any herbicide mixture

2008 Yellow Nutsedge Control Trial

The objective of this study was to observe the effectiveness of Sedgehammer 75WDG (Halosulfuron) and Dismiss 4F (Sulfentrazone) on yellow nutsedge (Cyperus esculentus) control. It was conducted at the Iowa State University turfgrass research area in a non-irrigated area of mixed grass species that contained a high population of yellow nutsedge. The Sedgehammer was combined with the X77 surfactant at 0.25% v/v. No surfactant was used with the Dismiss. Plots measured 5 × 5 ft for a total of 25 ft2 and the study was replicated three times. Treatments were applied in the equivalent of three gallons of water/1000 ft2