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| Occurrence and evaluation of major diseases and insectpests on main sugarcane varieties in medium-termgrowth peroid in Guangxi |
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| DOI：10.16768/j.issn.1004-874X.2016.06.022 |
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| Abstract: |
| To determe the major diseases and insect
pests of sugarcane and the resistance to diseases，the
occurrence of major diseases and insect pests on 11 main
sugarcane varieties cultivated in 8 producing areas of
Guangxi during the medium-term growth peroid in 2015
was investigated，and the resistance to smut and mosaic
diseases in the field was evaluated. The results showed
that the dead heart rate（ DHR） ranged 0.00%-38.55%，new-planting of Guiliu 2 and ratoon of Liucheng 05-136 varieties were most serious in Beihai city，and the DHR were
38.55% and 37.66%，respectively. Smut disease rate ranged 0.00%-24.89%. sugarcane ratoon was more susceptible
than new-planting to smut in all investigated varieties. Variety ROC22 was most susceptible to smut and identified as
moderate susceptible. Guiliu 2 was the second susceptible and identified as resistance with smut disease rate 7.45%，
and the 9 rest varieties had high resistance. Sugarcane mosaic diseases were mildly occurred in Guangxi，the disease rate
ranged 0.39%-7.73%，ROC22，GT42 and Guiliu 2 expressed moderate resistance and the rests exhibited resistance.
Sugarcane destroyed seriously in Nanning and Beihai more than other producing areas. The evaluation system of variety
resistance to sugarcane borers expected to be constructed. ROC22 was most susceptible to smut，compared with other
main varieties. Mosaic diseases were minor in Guangxi. Accurate evaluation of the resistances to smut and mosaic should
comprehend the expression of multi-location and multi-year. |
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