網路城邦
字體:
訪客簿  我要留言 共有 267 則留言
☆ 本部落格訪客簿 歡迎你留言唷!
頁/共 27第一頁 上一頁 下一頁 最後一頁

Reed
等級:8
留言加入好友
2007/08/05 10:14
若相片copy來自e-mail,則務必先下載,否則一旦刪除該e-mail,則相關連結亦告消失。

其次調整相片尺寸,即長與寬的像素,例如 600 x 450,儲存時再調檔案大小至100K左右,以方便上傳UDN相簿或文章中。

【光影魔術手】,是一套小而美的免費軟體,還可事後補光,非常好用,不妨一試。
http://city.udn.com/v1/city/forum/article.jsp?aid=1561752&tpno=0&no=53171&cate_no=57756

敬請人道支援 我卓越不群的母親

八旬阿嬤
【台灣司法◎人間煉獄】部落格

Robin ~
等級:8
留言加入好友
2006/05/17 04:14

請教木香先生:

為甚麼才五月中旬,幾乎所有的玫瑰花,葉片上均有黑色斑點? 經過不就變成黃色然後脫落..

因為玫瑰花才剛開,我不想這麼快就灑藥,可是又不希望看到不健康的葉子. 在此請教先生要如何治療 ?

先謝謝您了 !

Robin

林 彬(muxiang) 於 2006/05/17 22:50 回覆:

Dear Robin: Nice to hear from you!

This is Black Spot, that caused the surfaces of the leaves surrounded by a yellowish area outside the blackspot, the spots will eventually grow together and cause the leaf to turn yellow, wilt, and fall off. This would cause the plant  unable to function as using sunlight to produce energy for plant to grow and blooms.

Since BlackSpot  can be prevented by regular applications of fungicide spray, just make sure sprayed on both upper and lower surfaces of the leaves and stems; rotate application every two weeks and do it in the morning while the weather is not so hot.

I know you don't like to spray any fungicide as many of us, here are a few suggestions would give you a good start:

1, Variety: Select the good healthy variety

2, Location: plenty of sun, space and airflow

3, Soil: pH 6-7  and well drainage

4, Pruning: early spring cut back to initiate  new grow

5, Sanitation: Keep Clean each early spring clean up all the old leaves or debris

Since you already have roses grown on the ground for many years, then it might be able to  prevent this disease by limiting rose bush exposure to excess water, watering in the morning and only apply to the roots zone not on the leaves, make sure to give enough space between each rose. Air circulation can be improved by pruning and make sure to discard any dead stems or leaves to keep place clean.

In your case if BlackSpot has already effect badly, “Cut Back = Pruning”might be effective remedy. Again clean up area well to void disease reproduces. Please be caution to cut back your rose, it must be cut up to the good healthy eye(bud) and leave good healthy green stems.

Hope this would help!

Ping

頁/共 27第一頁 上一頁 下一頁 最後一頁