月季嫩枝蔫死掉是什么原因?

xm3344521

你看看是不是根出问题了

internist

xm3344521 发表于 2016-4-13 10:05
你看看是不是根出问题了

因为是大片的出问题，月季的根出问题可能性小。因为有些是盆栽，有些是地栽的，隔壁的也是地栽的。

internist

百度上有详细说明。
http://tieba.baidu.com/p/4468952626

日子如莲

学习了

山映斜阳

我家每年都有这种情况，我觉得是太阳太毒，月季的嫩芽受不了所致。如果早发现，赶紧用伞遮挡阳光，就可比避免。

internist

山映斜阳 发表于 2016-4-13 16:37
我家每年都有这种情况，我觉得是太阳太毒，月季的嫩芽受不了所致。如果早发现，赶紧用伞遮挡阳光，就可比避 ...

太阳太毒?可能性很小。我的月季有一棵种在树荫下，而且这是4月初，温度也就25度，阳光有多毒?

山映斜阳

我的就是怎样的，你不相信也没有办法。

带嘴的南京

有的是茎蜂，但有的不是。我也存在这个问题，但绝对不只是茎蜂！

internist

因为各人的看法不一，加之我到现在也没找到一只茎蜂，我怀疑是缺什么东西，所以我就到国外网查子一下，国外的观点与我们有些差别。

Top Leaves Wilting in a Rose Bush
by Bridget Kelly  


Even though a rose bush may be plagued with various problems, it takes a lot for it to actually wilt. These woody perennials typically stand up to drought when planted in soil, even in intense heat, with nary a lost leaf. The rose, after all, has survived some 35 million years, according to horticulturists at the University of Illinois extension. There are only a few reasons that the top leaves on a rose bush might wilt.


Calcium Deficiency

A calcium deficiency in the soil will cause the top of the rose plant to wilt. Eventually the foliage curls, turns brown and may die. Bone meal is an excellent and organic soil additive packed with calcium, according to Steve Jones of the Santa Clarita Valley Rose Society. Apply the amount of bone meal suggested on the bag’s label. Wear gloves and a dust-excluding mask when you work with bone meal as it may make you sick, according to D. Carleton Gajdusek, author of “Deadly Feasts.”


Boron Deficiency

Roses need boron to transfer sugar and starches between cells, and it influences the necessary hormones and enzymes for cell division. Symptoms of a boron deficiency are similar to those of a nitrogen shortage. The difference is that symptoms of a nitrogen deficiency typically appear first at the bottom of the plant. If the rose is begging for boron you’ll notice that new leaves at the top of the rose bush turn yellow and twist or curl and wilt. A foliar spray of 1/4 cup of boric acid in 2 gallons of water should help the rose.


Downy Mildew

Downy mildew, a disease caused by microbes in the Peronosporaceae family, starts at the top of the rose bush with the spores invading the undersides of the foliage. It comes on very quickly in cool, damp weather. Along with wilting, look for purplish-red or brown splotches on the leaves. Use a fungicide that contains mefenoxam for control and mancozeb for protection.


Japanese Beetles

From a distance, if your rose bush looks wilted at the top, take a closer look. Inspect the leaves and flowers for holes. If you’ve found them, you’ve solved the problem: Japanese beetles are munching on the plant. These pests start at the top of the rose bush, merrily eating their way to the bottom. The damage they leave behind resembles lace instead of foliage. The leaves may be so damaged that they appear wilted. To effectively control Japanese beetles requires a multi-pronged approach. Treat any nearby turf areas in late summer with Heterorhabditis bacteriophora, a parasitic nematode available under several trade names or the bacterium Paenibacillus popilliae. These products kill the Japanese beetle’s grubs. Attack the adult beetle population on the rose by hand removing the pests and tossing them into a jar of soapy water or using a pesticide labeled for use on roses to control Japanese beetles.

internist

国外认为有四个原因：缺钙，缺錋，霜霉病，日本甲壳虫。我己经施用錋肥料，等着看效果。