Influence of nitrogen levels and plant spacing on the incidence of rice stem borers in Abakaliki, southeastern Nigeria

This experiment was conducted at the farm of field crop department, College of Agriculture, University of Baghdad during two summer seasons (2010 and 2011) in order to know the response of cotton var. Lashata to nitrogen levels and spacing between holes. A randomized complete block design under arrangement of split plot with four replications was used. The plant spacing; 10, 20 and 30 cm between holes and 75 cm between rows considered as main plots, while three nitrogen levels (150, 200 and 250 Kg N.ha-1) are considered as sub plots. The results showed that using 10 cm between hills were significantly superior in boll weight (3.69 and 4.26) gm.boll-1, seed cotton yield (3.03 and 3.6) t.ha-1 and lint yield (1.13 and 1.30) t.ha-1 in both seasons 2010 and 2011 respectively. While, 30 cm spacing significantly superior in number of open bolls (12.10 and 13.6) bolls.plant-1 and ginning percentage (39.05 and 37.44)% in both seasons respectively. The nitrogen fertilizer 250 kg N ha-1 was significantly superior in dehiscence bolls number, seed cotton yield, lint yield and ginning percentage in both seasons 2010 and 2011 respectively. It can be concluded that 'using 10 cm spacing between holes with 250 kg N ha-1 to achieve highest seed cotton yield.

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Integrated Management of Rice Stem Borers in the Yangtze Delta, China

Area-Wide Control of Insect Pests ◽

10.1007/978-1-4020-6059-5_35 ◽

2007 ◽

pp. 373-382 ◽

Cited By ~ 12

Author(s):

Z-R. Zhu ◽

J. Cheng ◽

W. Zuo ◽

X-W. Lin ◽

Y-R. Guo ◽

...

Keyword(s):

Integrated Management ◽

Yangtze Delta ◽

Stem Borers ◽

Rice Stem Borers

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Farmers’ Perceptions of Rice Production Constraints and Stem Borers Management Practices in Tanzania

Journal of Agricultural Science ◽

10.5539/jas.v10n6p57 ◽

2018 ◽

Vol 10 (6) ◽

pp. 57 ◽

Cited By ~ 1

Author(s):

Bonaventure January ◽

Gration M. Rwegasira ◽

Tadele Tefera

Keyword(s):

Management Practices ◽

Insect Pests ◽

Group Discussion ◽

Stem Borer ◽

Rice Production ◽

Stem Borers ◽

Access To Credit ◽

Cultural Methods ◽

Rice Stem Borers ◽

Rice Ecosystems

Rice farmers in Tanzania continue to experience losses due to stem borers. However, the information on farmers’ knowledge and perceptions of rice stem borers is limited and farmers’ efforts on managing this insect have been ineffective. The aim of this study was to investigate constraints affecting rice production and farmers’ approaches of stem borer management in irrigated low land rice ecosystems in Tanzania. Research method: A focus group discussion with farmers using a semi-structured questionnaire was used for data collection. The information collected included: farmers’ socio-economic profiles, farm characteristics, knowledge and perceptions of stem borers and their management practices.Farmers reported insect pests such as stem borers, white flies, leaf rollers and grasshoppers as major constraints of rice production. Other constraints reported were such as diseases, damage by birds, drought, weeds and lack of access to credit for purchasing inputs. Most of the farmers apply chemical insecticides against rice insect pests particularly stem-borers where number of health hazards have been reported. Very few farmers use cultural methods including crop residue disposal and split application of nitrogenous fertilizers for reduction of stem borer damages. The study revealed that, most farmers have limited knowledge on the recommended stem borer management practices and suggests that environmentally friendly pest management methods to be designed and implemented to minimize losses associated with rice stem borers.

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