บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Requerimientos de humedad relativa y tiempos de incubacion para la infeccion de conidios de Colletotrichum gloeosporioides en frutos de papaya.

Duran, A.; Ramirez, L.; Mora, D.;

Agronomia Mesoamericana Year: 1998 Vol: 9 Issue: 1 Pages: 81-85 Ref: 8 ref.

1998

บทคัดย่อ

Relative humidity requirements and incubation periods for Colletotrichum gloeosporioides conidia infection in papaya fruit.

The research was carried out in the University of Costa Rica's phytopathology laboratory during October 1995-March 1996. In the initial phase, creole pawpaw fruits from Gu-cimo (Limon province) were used. To eliminate latent infections, they were washed and immersed in hot water (49 deg C for 20 minutes) and then randomly placed in groups of 20. Finally, they were inoculated by spraying 5.5 ml of a 10 000 C. gloeosporioides [Glomerella cingulata] spores/ml suspension, placed in plastic boxes and stored in containers at 30 deg and relative humidities of 70%, 80% and 90%. Fruits were kept in the compartments for 5, 10, 15, 20 and 25 hours. Temperature and relative humidity were monitored during the experiment through the incubator's sensors and with a portable hydrothermograph. The incidence and severity of anthracnose was evaluated. During the second phase, Hawaiian Sunrise pawpaws were used, the same procedures were applied. In creole fruits, 100% of those placed at 80% and 90% relative humidity

 were infected after being in the compartment for 5 hours. The incidence decreased in the group with 70% relative humidity. The damage level increased with increases in relative humidity, although some erratic behaviour was observed. In the test with Hawaiian fruit, disease incidence increased with incubation time. Severity showed a similar pattern, but there was also erratic behaviour.