Field Guide of Discovery-based Exercises for - Aseanipm ...

Exercise No. 5.19 209
USING RESISTANT VARIETIES AS A MANAGEMENT
STRATEGY AGAINST BEAN RUST DISEASE OF
ORGANICALLY-GROWN LEGUME VEGETABLES
BaCKGroUND aND raTIoNalE
The development of resistant or tolerant varieties through
selection and breeding is one of the best approaches
to pest management 210 . Sometimes, growing cultivars
resistant to a particular disease is the only way in which
diseases can be controlled. Overhead irrigation during
dry season, right timing of planting and general field
sanitation are known to reduce incidence of bean rust.
However, using bean rust resistant varieties is a more
316
Field Guide of Discovery-based Exercises for Organic Vegetable Production
practical and economical disease management approach for organically-grown legume vegetables.
In the Cordilleras, organic farmers themselves through their experiences select outstanding varieties
most suitable to local growing conditions. Vegetable varieties that are high yielding, tolerant to
diseases and environmental stresses are selected for seed production. In the case of bean rust,
farmers had identified which among their organically-grown legume vegetables are more resistant
or tolerant to the disease during a particular season. These experiences must be regularly shared
among farmers in farmer field schools (FFSs) to update their knowledge on local adaptability of
these legume varieties. This exercise was designed to achieve this purpose.
How long will this exercise take?
when is this exercise most
appropriate?
ɶ In FFS, TOT, and VST
session, before planting
organic leguminous
vegetables in learning field;
and
ɶ When farmers want to
learn varietal adaptability
of organically-grown
leguminous vegetables to
bean rust and other stresses
from other farmers.
• Thirty minutes to one hour for field walks and observations of organically-grown leguminous
vegetables most adapted to bean rust and other stresses in learning and adjoining fields; and
• Thirty minutes to one hour for brainstorming session in processing area.
209 Adapted from Callo, Jr., D.P., L.B. Teofilo, and H.A. Tauli (eds). 2002. Field Guide of Discovery-based Exercises for Vegetable IPM, Volume II. SEAMEO
Regional Center for Graduate Study and Research in Agriculture (SEARCA), Los Baños, Laguna, Philippines. pp232-234.
210 Bautista, O.K. (Ed) 1994. Introduction to tropical horticulture. 2 nd Edition. SEAMEO Regional Center for Graduate Study and Research in Agriculture
(SEARCA) and University of the Philippines Los Baños (UPLB), College, Laguna, The Philippines. pp366-379.