Weed Management Challenges in Rice Cultivation in the Context of Pesticide Use Reduction: A Survey Approach

Abstract

Weeds are the main phytosanitary problem in rice crop. Over-reliance on herbicides and lack of crop operations range in the rice system have produced intense selection for the evolution of resistant weed populations. This study focused on rice farmers’ perceptions and attitudes towards weeds and agricultural practices for weed management. The methodology of a questionnaire was used, carried out in person with rice producers in the main rice producing regions in Portugal, complemented by three focus groups. The outcomes reveal that Echinochloa spp. is the weed of greatest concern, followed by Oryza sativa var. sylvatica. New weeds are about to emerge, mainly Leptochloa fusca ssp. fascicularis. It will be critical for performance at the innovation ecosystem level to achieve evolution in social capital. Policies that promote innovation for the performance of more ecological and sustainable practices must be settled. The problem of herbicide resistance is increasing with the reduction in the number of active substances. There is great difficulty in adopting non-chemical weed control to meet the requirements of the European Ecological Pact. The implementation of these alternatives cannot be widespread, but must be studied on a case-by-case basis and requires technical monitoring adapted to the region and to the plot.

Improving a herbicide risk assessment model in paddy rice cultivation

“…Another possible explanation that leads the model to overestimate groundwater herbicide's fate is the natural groundwater flux that could effectively move herbicides away from the corresponding groundwater catchment. Moreover, DT50 values used as model input are obtained by field or laboratory values from a database and may not be applicable to pesticide behaviour under flow conditions in the field [ 4 ].…”

“…Chemical-based control with herbicides is considered the most effective option for farmers among the available possibilities for weed management and control in rice paddies [ 2 , 3 ]. Although the use of herbicides is essential for production, environmental contamination is inevitable [ 4 ].…”

Effects of Sustainable Rice Management on the Behavior and Bioefficacy of Bispyribac-Sodium: A Medium-Term Study

“…The pots were placed inside a growth chamber and kept at 25 • C with 12 h of daylight for 14 days. Then, for each management condition, weeds were removed by hand and 10 pre-germinated seeds of Echinochloa crus-galli L. (one of the main rice weeds in Europe [1]) were put in each pot. After 10 d, BPS was applied to one set of pots at the recommended dosage of 100 g ha −1 , leaving another set as controls without herbicide.…”

“…Weeds can lead to significant rice (Oryza sativa L.) yield losses, thereby reducing the viability of growing rice, which is a staple food for a large part of the world's population [1]. Therefore, weed control in rice fields is crucial to ensuring global food security [2,3].…”

Divergence in Glyphosate Susceptibility between Steinchisma laxum Populations Involves a Pro106Ser Mutation

“…However, weed management poses a constant challenge for rice growers, leading to significant losses in yield and quality [ 4 ]. Moreover, herbicide resistance is becoming a major challenge in rice production across the Americas [ 5 , 6 ].…”