ISSN:0030-7793    

DOI:10.1080/09670877209412696

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The symptoms and extent of lethal yellowing disease of coconuts are described. In research into the cause of the disease nutrient deficiencies, fungi, bacteria, nematodes and, more recently, viruses have been investigated without implicating any causal agent. Mechanical and insect transmissions were attempted by a number of methods. The incubation period was shown to be 3–9 months for young palms and 7–15 months for bearing palms. Experiments to control the disease have been unsuccessful.

ISSN:0030-7793    

DOI:10.1080/09670877209412697

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877209412698

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877209412699

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877209412700

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Experiments conducted at the International Rice Research Institute (IRRI) in the Philippines, showed that all commonly marketed formulations and derivatives of 2,4-D and MCPA were equally effective in controlling barnyard grass [Echinochloa crusgalli(L.) Beauv.] and other annual weeds in transplanted rice (Oryza sativaL). In the Philippines, these phenoxy acid herbicides cost US$2.50/ha as liquid formulations and US$5.50/ha as granular formulations. These low-cost herbicides provide excellent alternatives to hand weeding in transplanted tropical rice. Other herbicides which can control weeds before or after the weeds emerge are more expensive than 2,4-D or MCPA. Some of these selective herbicides, such as butachlor and TCE-styrene + 2,4-D, are in the Philippine market. Their prices vary from US$8 to US$12/ha.

ISSN:0030-7793    

DOI:10.1080/09670877209412701

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877209412702

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877209412703

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877209412704

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0030-7793    

DOI:10.1080/09670877209412705

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor