Summary and conclusion of session on breeding biotic stresses - maize diseases
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TextPublication details: Los Baños, Laguna (Philippines) PCARRD : 2000Description: p. 617Subject(s): Summary: The presentations related to description of maize diseases present in different countries give a good background of the situation of maize diseases in Asia. With that background, the discussion was guided towards analysis of specific topics related to regional collaborative projects on specific diseases including downy mildews (DMs), stalk rots (SRs), and banded leaf and sheath blight (BLSB).|I. Downy mildews:|a. The use of lower levels of metalaxil as a seed treatment could be one of the reasons for the increased tolerance to the fungicide that has been observed. The savings involved in applying lower levels of fungicide will result in a more expensive control of these diseases|b. The classification of DM species needs to be reviewed. New technologies will clear the questions that have emerged recently on relationships between previously identified species of these fungi.|c. The breeding for resistance to all DMs in maize was recommended.|2. Stalk rots:|Activities on breeding for stalk rot resistance carried out by Indian researchers was commended. Now that lines have been generated with acceptable levels of resistance, it would be convenient to include the bulks, and selected lines of the populations, in nurseries to be distributed to interested programs. Best performing lines across locations can be utilized in the development of hybrids or synthetics by collaborators or by the Maize Directorate, India.|3. Banded leaf and sheath blight:|a. It has been difficult to identify resistant gerrnplasm. Experiences with disease nurseries established in S. China and India, indicate that there are different reactions for resistance between these locations. This is probably due to differences in virulence in the isolates present at those locations. The collection of fungal isolates in countries in the region is recommended to study the differences between these isolates, anastomosis groups, etc.|b. The re-establishment of disease nurseries where the same maize entries are screened for resistance was recommended.|
| Item type | Current library | Collection | Call number | Copy number | Status | Date due | Barcode | Item holds | |
|---|---|---|---|---|---|---|---|---|---|
| Conference proceedings | CIMMYT Knowledge Center: John Woolston Library | CIMMYT Staff Publications Collection | CIS-3395 (Browse shelf(Opens below)) | 1 | Available | 631363 |
The presentations related to description of maize diseases present in different countries give a good background of the situation of maize diseases in Asia. With that background, the discussion was guided towards analysis of specific topics related to regional collaborative projects on specific diseases including downy mildews (DMs), stalk rots (SRs), and banded leaf and sheath blight (BLSB).|I. Downy mildews:|a. The use of lower levels of metalaxil as a seed treatment could be one of the reasons for the increased tolerance to the fungicide that has been observed. The savings involved in applying lower levels of fungicide will result in a more expensive control of these diseases|b. The classification of DM species needs to be reviewed. New technologies will clear the questions that have emerged recently on relationships between previously identified species of these fungi.|c. The breeding for resistance to all DMs in maize was recommended.|2. Stalk rots:|Activities on breeding for stalk rot resistance carried out by Indian researchers was commended. Now that lines have been generated with acceptable levels of resistance, it would be convenient to include the bulks, and selected lines of the populations, in nurseries to be distributed to interested programs. Best performing lines across locations can be utilized in the development of hybrids or synthetics by collaborators or by the Maize Directorate, India.|3. Banded leaf and sheath blight:|a. It has been difficult to identify resistant gerrnplasm. Experiences with disease nurseries established in S. China and India, indicate that there are different reactions for resistance between these locations. This is probably due to differences in virulence in the isolates present at those locations. The collection of fungal isolates in countries in the region is recommended to study the differences between these isolates, anastomosis groups, etc.|b. The re-establishment of disease nurseries where the same maize entries are screened for resistance was recommended.|
English
0208|AGRIS 0201|AL-Maize Program|R01PROCE
Juan Carlos Mendieta
CIMMYT Staff Publications Collection
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