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Garden Pests and Diseases: Salvia problem

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Pagancat
(Sheryl) Gainesboro, TN
(Zone 6b)

July 28, 2008
3:31 PM

Post #5332292

Hi - I have a problem with my Salvia (nemerosa, I think ) 'May Night'. The previous owner planted it all over the place, with different exposures, likely different soils, etc. but they all look bad. The first thought that came to me is that they're chlorotic, but I would be surprised that *all* of them are, unless they're heavy feeders or something (I'm not known for my use of fertilizers). But if you're not familiar with the plant, the leaves are usually a uniform medium to dark green.

A neighbor suggested a fungus - if so, it's not living on the leaves, per ce - there's nothing to scrape off or anything.

Here's the pic, any help is greatly appreciated!

Sheryl

Thumbnail by Pagancat
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ecrane3
Dublin, CA
(Zone 9a)

July 28, 2008
8:15 PM

Post #5333668

I'd check the underside of the leaves for spider mites. It's not chlorosis (salvias don't need a lot of fertilizer anyway) and it doesn't look fungal, but it could be spider mite damage (or some other sucking insect). I've had problems with spider mites on my salvias in the past, they're one of the few pests that I've found that enjoy the taste of salvia.

If you're not familiar with SM's, they are very, very tiny, look for teensy little brownish or reddish brown dots on the underside of the leaves. If it's a bad infestation you may find some webbing on the undersides as well.
Pagancat
(Sheryl) Gainesboro, TN
(Zone 6b)

July 29, 2008
12:14 AM

Post #5334946

Huh ... okay, I'll take a look, thanks!
luis_pr
Hurst, TX
(Zone 7b)

July 29, 2008
9:15 AM

Post #5336770

You can place a 8.5 x 11 white sheet of paper under a plant and shake it to see what falls down. SMs will appear as very tiny dots that move on the paper. In a really bad infestation, you will notice some webbing as seen in the picture link below:

http://images.search.yahoo.com/images/view?back=http://images.search.yahoo.com/search/images?_adv_prop=image&fr=slv8-tyc7&va=spider+mites&sz=all&w=400&h=273&imgurl=www.dahlias.net/dahwebpg/Insects/InsectImages/SpiderMites2.JPG&rurl=http://www.growquest.com/spider_mite__leaf_damage.htm&size=15.4kB&name=SpiderMites2.JPG&p=spider mites&type=JPG&oid=e15736c9a837649a&no=7&tt=5,101&sigr=11l3pd7df&sigi=11u5v3qd5&sigb=130bjc5q3

Miticides as well as lady bugs will keep this pest under control.

Lacebugs can also affect salvias, causing damage similar to the one you see in your leaves: http://www.topturf.net/lacebugs.htm

Click here to see lacebug pictures: http://images.search.yahoo.com/search/images?_adv_prop=image&fr=slv8-tyc7&va=lacebug&sz=all

Natural predators, Insecticidal soap, horticultural oil, neem oil, Bayer Tree and Shrub Insecticide can be used in a sprayer to combat this pest. For either pest, spraying the underside is critical because that is where these pests hide. I have also used systemics to control this problem in my azaleas but I apply them in March/April.

Note: if you apply insecticides/oils, re-apply again later per label directions to kill any pests that come out of eggs that hatch after your first application.
Note: if you apply insecticides, do not release lady bugs and similar predators of SMs and lacebugs because the insecticide will indiscriminately kill everything it comes in contact.
ceejaytown
The Woodlands, TX
(Zone 9a)

July 29, 2008
10:44 PM

Post #5340145

If it is spider mites, water sprays alone will control them. They don't like wet feet. Spray the water up under the leaves, several days in a row, and repeat again a few weeks later for any eggs that may have hatched afterward.

Although I prefer the systemic pesticides because they don't kill the good guys, I don't use them on flowering plants that attract butterflies. And Salvia attracts butterflies. However, according to the director of Cockrell Butterfly Center in Houston, insecticides made of imidacloprid (which is systemic) are not toxic to butterflies.
Pagancat
(Sheryl) Gainesboro, TN
(Zone 6b)

July 30, 2008
12:20 AM

Post #5340562

Thanks for your input, you three. It does appear to be spider mites.

Ceejaytown, that was always what I had been told, too - I'm just surprised that we have them as we've had a fairly wet summer. I was thinking about a water/soap spray for a few days, but I've really no idea if the soap will do anything in this case or not.
ceejaytown
The Woodlands, TX
(Zone 9a)

July 30, 2008
12:39 AM

Post #5340680

The soap will dessicate their exoskeletons, so that is helpful. I would check first to see if there are any beneficials - it will dessicate them too. But if not, go for it!
ecrane3
Dublin, CA
(Zone 9a)

July 30, 2008
12:50 AM

Post #5340744

I've also had good luck controlling mites with the hose--usually though I get them on my container plants so it's easy to just tip the container on its side and give the undersides of the leaves a good hosing off. A little harder to do with things in the garden, but it's definitely the least toxic way to go. As far as the systemics--I have read some things suggesting that imidacloprid is toxic to bees. I have never thought about using it in my garden anyway so I never really dug in to see what the evidence was one way or another, but it's something you might want to look into if you were considering going that route.
ceejaytown
The Woodlands, TX
(Zone 9a)

July 30, 2008
2:01 AM

Post #5341184

Since it hasn't been determined (scientists are looking at a variety of factors), and even though it appears at this time that imidacloprid is not involved, it is still best to avoid the widespread use of any pesticide. I HAVE looked into it, since it has become the first recommended pesticide when applicable at Extension. I still have my concerns.

http://www.ars.usda.gov/is/AR/archive/may08/colony0508.htm

This message was edited Jul 29, 2008 9:01 PM
Pagancat
(Sheryl) Gainesboro, TN
(Zone 6b)

July 30, 2008
2:57 AM

Post #5341618

Hose it is!

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