This paper describes a dynamic simulation model that allows for comprehensive assessment of integrated weed management programmes for the control of annual barnyardgrass (Echinochloa crus-galli complex) in Philippine rice farming systems. The main outputs of the model include weed seed and plant densities and seasonal and annualised profit over the simulated planning horizon. Results broadly in...

The rice stink bug, Oebalus pugnax (Fabricius) (Hemiptera: Pentatomidae: Carpocorini), though graminaceous, discriminates among its numerous host grass species. This could represent a feeding preference, it could be related to host suitability for growth and development. To clarify the role of host grass discrimination, two laboratory studies were conducted: (1) free-choice tests to evaluate pr...

Bolstering the framework is free HIV/ AIDS and TB training for campus staff by SAMA’s Foundation for Professional Development (FPD), and access to the HIV911 service run by the Centre for HIV/AIDS Networking (HIVAN), a University of KwaZulu-Natal NGO. The HIV911 service enables appropriate referrals for students and staff by providing a database of information on 6 500 organisations that provid...

The CPD paper trail is prohibitively expensive, and the Board has determined that the publishing division must contain costs. I am sorry that my comments came across as ‘hard cheese’ – that was not intended. We had anticipated difficulties with the new process and have not been disappointed. Emily Nel at the SAMA Western Cape Branch has indicated her willingness to enter the questionnaires on b...

Soil in laboratory microcosm experiments was amended with dried and milled crop residue of onion (Allium cepa L. cv. Mission) or garlic (A. sativa L. cv. California Early). The amend ments, along with the additional factors of amendment concentration (0, 1 or 3% (w/w)) an soil temperature (23 or 39 8C), were evaluated with respect to germination of seeds of th weedy annual plants Echinochloa cr...

A population of junglerice from Sunflower County, MS, exhibited resistance to fenoxaprop-P-ethyl. An 11-fold difference in ED50 (the effective dose needed to reduce growth by 50%) values was observed when comparing the resistant population (249 g ae ha ) with susceptible plants (20 g ae ha ) collected from a different field. The resistant population was controlled by clethodim and sethoxydim at...