張明聰 黃杉茋 呂俊堅
The Effect of Polyethylene-cloth Sheltering on the Mango Production
Chang, M. T., S. C. Hwang and C. J. Leu
A nine-year mango (cv, Irwin) orchard at Yuh-Jiing of Tainan Prefecture was selected and covered with polyethylene-cloth one meter above the canopy for avoiding from rain. Continuous surveys were conducted form 1988 to 1989 to evaluate the effect of sheltering on the incidence of disease and insects, and the yield and quality of mango fruits. Results were summarized as follow:
1. The percentage of anthracnose on leaf, inflorescence and fruits of mango decreased significantly from inflorescence shooting to fruit ripening stage occurrence under sheltering condition, and disease was more easily controlled.
2. The anthracnose disease on mango fruit after harvesting from in-sheltering was also less than control plants.
3. The percentage of powdery mildew of inflorescence and the number of leafhopper on mango under PE-cloth sheltering were not significantly different to the control.
4. Bigger fruit size, higher brix, longer inflorescence and large leaf area were obtained through sheltering.
5. Treatment also improved the marketing quality of mango fruits.
Accepted for publication: October 16, 1990.