defoliation
1.Rapid defoliation ...Rapid changes in temperature, or light. Overwatering, underwatering, or exposure to drafts.
2.The tolerance thresholds for defoliation stages ranged between 20.6 and 34.8 DAT(d) or 61.6-75.8 days after sowing(d), and for defoliation levels ranged from 0% to 26%.
3.In order to analyse soil chemical properties under dominant trees of different defoliation percentages and contents of elements in their needles, some dominant trees of different defoliation percentages (0%~20%, 20%~40%, 40%~60% and 60%~99%) in pure stands of Pinus massoniana at Tieshanping of Chongqing were selected according to European criteria for dividing defoliation percentages.
4.The results indicated that the compensation thresholds of Sanyou-10 for defoliation stages ranged from O to 29.5 DAT(d) or 41-70.5 days after sowing(d), and for defoliation levels ranged from 0% to 58%.
5.defoliation character and the DBH,growth phase and the height character was positively correlated to each other moderately;
6.small black sawfly native to Europe but established in eastern United States; larvae mine the leaves of birches causing serious defoliation.
7.Atificial defoliation by foliar spray of ABA and ethphon had a better effect on the quality of leaves and flower than by manual only.
8.Caragana Microphylla Lam livings the defoliation bush for many years, a department prospers, ising a good tree to defends the breeze sand and keeps Water and soil to grow.
9.Gradual defoliation (lower leaves yellow and fall) ... Overwatering (root damage), underwatering (not enough water to support full foliage), lack of sufficient light, or lack of fertilizer.
10.A decrease of source-sink ratio prompted a decrease in SOD activity,POD activity and soluble protein content in ear leaf, the reason of which maybe defoliation caused leaf hurt.
