3种化学药剂对清家脐橙夏梢的抹芽控梢作用

Control Effects of Three Chemicals on Young Summer Shoots of Seike Navel Orange Trees

为调控柑桔梢果矛盾,本试验选取3种化学药剂,每种药剂2个浓度,分别喷布长度大于4cm和小于4cm的清家脐橙嫩夏梢,以清水为对照。结果表明:0.03%(按有效成分计,下同)和0.06%乙烯利对嫩夏梢的触杀致死率均在98%以上;0.05%和0.10%啶嘧磺隆对4cm以下嫩夏梢触杀致死率均达100%,但对4cm以上嫩夏梢触杀致死率分别为91.34%和100%;0.010%和0.042%氟磺胺草醚对4cm以上嫩夏梢触杀致死率仅分别为12.27%和2.42%,对4cm以下嫩夏梢触杀致死率分别为56.37%和95.79%。0.03%和0.06%乙烯利会引起少数老叶掉落,其余2种药剂对果实和成熟枝叶安全。

In order to balance the growth between fruit and shoots,three chemicals were sprayed at two concentrations on young summer shoots of less and longer than 4 cm on Seike navel orange（Citrus sinensis Osbeck） trees.The results showed that the young shoot killing rates of 0.03% and 0.06% of ethephon were above 98%;0.05% and 0.10% of flazasulfuron killed all of the ≤4 cm young summer shoots,91.34% and 100% of the 〉4 cm young summer shoots,respectively.0.010% and 0.042% of fomesafen killed only 12.27% and 2.42% of the〉4 cm young summer shoots and 56.37% and 95.79% of the ≤4 cm young summer shoots.Ethephon at both concentrations caused abnormal abscissions of old leaves while the other two chemicals were safe to fruit and leaves.