Serving the Hobby...
Since 1998!
Sour Crop - Candida, Thrush
Cause - This very common disease is caused by a fungus
infection of the digestive tract. It is often associated
with excessive use of antibiotics.
Symptoms - Infected birds become listless, won't eat, lose
weight, develop a water-filled crop and vomit often. This
vomit often has a very putrid odor. Sometimes, in lesser
cases, thrush will show itself as just small whitish spots
in the throat, which causes confusion with canker. Another
much less noticed symptom, usually found only in adult
birds, is feather pulling.
Prevention - Avoid overcrowding, maintain a sanitary loft,
and most importantly, do not medicate indiscriminately.