I - --ii

infected seed is a much more potential source of inoculum than plant debris
considering the fact that out of 95 infected seeds 32% produced primary infected
plants.
Conclusions
Although the final analysis of our data has not yet been completed, the following
conclusions may be drawn and used as a base for further work:
1. Planting date delays the epiphytotic only if it is delayed beyond the
beginning of the natural epiphytotic.
2. The epiphytotic curve is characteristic for the degree of resistance of a
cultivar.
3. Disease intensity is a more reliable parameter for resistance than disease
frequency.
4. The onset of an epiphytotic is defined by weather data.
5. Disease of any significance cannot develop below average air temperatures
of 6C and with wetness periods less than 6 hours.
6. Fast epiphytotic development occurs between 9 and 24°C and at wetness
periods of 10 hours and more.
7. Plant debris is a very inefficient soil-borne source of inoculum.
8. Infected seeds are very efficient sources of inoculum.
9. Disease control in winter chickpeas should be based on healthy seeds,
seed treatment, genetic resistance and selection of proper locations.
Discussion
R. Pieters
If you use a percentage scale, how do you score a branch which died because of
one lesion at the base of the branch?
H.C. Weltzien
We have no special score for this situation but early stages of infection are
covered by our scale and at late stages we can score the actual percentage of
dead plant surfaces.
J.S. Grewal
Our experience shows that stem infection is more important than leaf infection
from the point of view of damage.
H. Haddad
Is there any simple method to identify infected seeds in a seed lot? Further if
you have a lesion, will this be enough to contaminate the seed lot?
H.C. Weltzien
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