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栀子花叶子发黑

美琪爱拍照
2017-05-24
#栀子花 叶片发黑、叶子下垂无力,有两种可能:

一、浇水过多:一般植物的浇水时机是表土摸起来有一点干才浇水,时间以上午9点以前及傍晚5~7点为宜,且每次要浇透,气候比较潮湿时,植物的蒸散作用较慢,每天浇两次水,易使根部无法正常呼吸甚至烂掉。因根在盆中不易看见,但地上部,如叶子,就会有黄化、下垂、落叶、枯死的现象,此时可将植株挖出看看根是否已烂,将变黑的根剪除再种,并按上述方法浇水即可。

二、虫害引起的#茶煤病

有下列三种害虫会引起煤病,若无法辨别,请参考书籍:

1、蚜虫:常呈浅绿色,约3mm,多聚于新芽、嫩蕾柔软部份。蒜头两粒打碎成汁加1公升水,再喷洒病株。

2、粉虱:白色,约2~3mm,多聚于叶背。1g洗衣粉加120cc水加几滴花生油或玉米油,拌匀喷洒或用刷子沾湿刷除。

3、介壳虫:种类多,呈棕、白或淡黄色,约1.5~3mm,吸食茎、枝、叶的汁液,成虫不会移动。以棉花棒沾酒精或肥皂水清除。

若上述各法仍未能奏效,需要用杀虫剂了。

栀子花管理要点:
1、栽培场所:栀子花喜温暖潮湿的气候,生长适温在20℃左右,宜选半日照的场所,不宜强烈阳光直射,夏季正午应稍加遮阴,冬季应有防寒措施。

2、用土:喜深厚、肥沃、稍带微酸性、保肥力强、排水良好的腐质质壤土,盆栽者应每年换盆一次,换盆时盆底置有机肥,如:骨粉、活性有机肥,再覆土8~10cm,再放入植株。

3、施肥:定植后,每3个月施一次长效性肥料,如好康多一号,施时应远离基部。

4、修剪:栽种2年后,每年春季剪除过密枝、枯枝、病枝、徒长枝或太接近地面的枝条,以利空气流通及阳光直射。
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