scholarly journals Studies on Sympetrum frequens (Odonata : Libellulidae) nymph as a natural enemy of the mosquito larvae, Anopheles sinensis, in rice fields : 2. Evaluation of predatory capacity and efficiency in the laboratory

1986 ◽  
Vol 37 (3) ◽  
pp. 213-220 ◽  
Author(s):  
Kenichi URABE ◽  
Takaya IKEMOTO ◽  
Chujiro AIDA
Keyword(s):  
Natural Enemy ◽  
Rice Fields ◽  
Anopheles Sinensis ◽  
Mosquito Larvae ◽  
Sympetrum Frequens ◽  
Predatory Capacity

scholarly journals Minimal tillage and intermittent flooding farming systems show a potential reduction in the proliferation of Anopheles mosquito larvae in a rice field in Malanville, Northern Benin

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Innocent Djègbè ◽  
Merdie Zinsou ◽  
Edia Flavien Dovonou ◽  
Geneviève Tchigossou ◽  
Murielle Soglo ◽  
...  
Keyword(s):  
Water Management ◽  
Malaria Transmission ◽  
Management System ◽  
Rice Field ◽  
Rice Fields ◽  
Rice Cultivation ◽  
Mosquito Larvae ◽  
Water Management System ◽  
Deep Tillage ◽  
Continuous Flooding

Abstract Background Irrigation systems have been identified as one of the factors promoting malaria disease around agricultural farms in sub-Saharan Africa. However, if improved water management strategy is adopted during rice cultivation, it may help to reduce malaria cases among human population living around rice fields. This study aimed to assess the impact of the different irrigation practices on malaria transmission, as well as to evaluate the water management system that will best mitigate malaria transmission in Malanville, Benin. Methods Knowledge, Attitude and Practice (KAP) study was conducted on 104 households staying on and around the rice fields in Malanville. The study focused on the frequency of mosquito bites and preventive measures against malaria as well as soil preparation and rice planting methods. Mosquito larvae density was assessed in different water management system: continuous flooding (CF) or intermittent flooding (IF), deep tillage (DT) or minimal tillage (MT) and normal levelling (NL) or abnormal levelling (AL) in an experimental hut set-up. Larvae were collected using dipping methods and their density was determined. Results Three tillage systems, which include the use of tiller, plow and hoe, were identified on the rice field. Continuous flooding was the only irrigation system used by farmers. Retrospective data from Malanville Health Centre revealed higher malaria cases during rice production season, which was also confirmed by field participants. The density of Anopheles larvae was reduced by 80.8%, 30.8% and 40.7% (P = 0.000) during transplanting, tillering and maturation periods, respectively with intermittent flooding compared to continuous flooding. In addition, a clear reduction of larva density was observed with both intermittent flooding systems applied to minimal tillage (MT + IF + NL) and intermittent flooding applied to deep tillage (DT + IF + AL), showing that intermittent flooding could reduce the abundance of malaria vector in rice fields. Conclusion Recommending intermittent flooding technology for rice cultivation may not only be useful for water management but could also be an intentional strategy to control mosquitoes vector-borne diseases around rice farms.

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