Interactions Between Weedy Rice and Cultivated Rice in Italy

Vidotto, Francesco; Ferrero, Aldo

doi:10.4081/ija.2009.4.127

Cited by 9 publications

(2 citation statements)

References 24 publications

(21 reference statements)

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“…Weedy rice can be taller, shorter or similar as the cultivated rice (Jana and Mallick 2013). Different plant height values are reported for weedy rice populations from different regions (Vidotto and Ferrero 2009;Fogliato et al 2011;Ahmed et al 2012;Jose et al 2016;Rathore et al 2016). The results for the plant height and panicle length are presented in Table 2 and Table 3, respectively.…”

Section: Plant Height and Panicle Lengthmentioning

confidence: 94%

Morphological and grain characterısatıon of Macedonian weedy rice (Oryza satıva L.)

Dimitrovski

Andreevska

Andov

2018

MJEE

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Rice fields in the main rice producing region of the Republic of Macedonia sown with San Andrea and Onice cultivars were investigated with the aim to evaluate some morphological and grain characteristics of the present weedy rice types. Six morphotypes (two fully awned, three partly awned and one awnless) with pigmented pericarp were identified on the basis of the panicle morphology and grain characteristics. The plant height, panicle length, number of tillers and panicles per plant were examined on 30 plant samples of each type and compared to the cultivar. The grain and caryopsis dimensions were examined on 30 grains of each type. The weedy morphotypes isolated from Onice showed significantly higher plant height (from 102.47 cm to 113.47 cm) and panicle length (from 19.90 cm to 23.07 cm) in the field conditions compared to the cultivar (plant height: 79.50 cm; panicle length: 12.13 cm). In the San Andrea field, the weedy morphotypes had a significantly lower plant height values (from 106.17 cm to 108.63 cm) and non-significant to significantly longer panicle (18.10 cm to 20.50 cm) compared to the cultivar (plant height: 114.07 cm; panicle length: 17.24 cm). Significantly higher number of tillers and panicles per plant was determined in weedy rice compared to the rice cultivars. The weedy rice grain dimensions (length, width and thickness) were ranged from 8.30 to 8.85 mm, from 3.29 to 3.61 mm and from 2.03 to 2.22 mm, respectively, while the caryopsis dimensions varied from 6.15 to 6.62 mm, from 2.74 to 3.02 mm and from 1.82 to 2.04, respectively. The weedy rice morphotypes had significantly lower values for the three grain dimensions compared to San Andrea cultivar. Regarding the caryopsis, weedy rice had significantly lower values for two to three dimensions compared to San Andrea, depending on the morphotype. The differences in grain dimension between WR1323232 and Onice cultivar were non-significant. The rest of the weedy morphotypes exhibited significantly lower values for one to three grain dimensions in comparison to Onice. Depending on the weedy morphotype, significantly lower values for one to two caryopsis dimensions were found in comparison to Onice.Weedy rice had significantly lower 100 grains weight (from 2.84 to 3.28 g) compared to San Andrea (4.07 g) and Onice (3.56 g). Significant differences in the studied characteristics were also evident between the weedy accessions.On the basis of the results obtained in the current study can be concluded that different weedy rice morphotypes occur in the rice producing region of the Republic of Macedonia. The descriptive

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Section: Plant Height and Panicle Lengthmentioning

confidence: 94%

Morphological and grain characterısatıon of Macedonian weedy rice (Oryza satıva L.)

Dimitrovski

Andreevska

Andov

2018

MJEE

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“…The presence of red rice in commercial paddy fields can also generate quality losses due to the presence of abnormal colored kernels in the milled rice. Reported yield losses due to red rice infestation vary from 16% in Vietnam [15], 50% in Italy [16], 46% to 58% in Greece [17], 27% to 45% in the U.S. [18]-with up to an 88% rice yield loss in Arkansas [19], and from 60% to 100% in Malaysia [20]. Red rice infestation can ultimately lead to the abandonment of rice fields due to the prohibitively high yield losses [11].…”

Section: Introductionmentioning

confidence: 99%

Economic Benefits of Controlling Red Rice: A Case Study of the United States

Durand‐Morat

Nalley

2019

Agronomy

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Red rice (O. sativa) is one the most prevalent and damaging weed problems in direct seeding rice systems worldwide and can cause significant losses in rice productivity and quality. Red rice has been a problem in the United States for decades, and it is a growing problem in Asia, where 90 percent of the global rice production occurs. Unlike for other crops, where genetically engineered (GE) herbicide tolerant varieties are available, to date, Clearfield (CL) and Provisia rice are the only technologies available to selectively control red rice using chemical herbicides in commercial rice fields. We develop a counterfactual scenario without CL rice and ascertain the yield and quality losses due to red rice infestation in the Mid-South of the United States. Our findings suggest that even with the higher costs of CL rice, relative to non-CL rice, that the returns are $0.15, $0.36, and $0.54 more for every dollar invested than non-CL rice with a light, moderate, and heavy initial red rice infestation rate, respectively. These results imply that the higher upfront costs for CL rice are offset by more than proportional higher profits relative to their non-CL rice counterparts.

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