Merit for Spider Mites

mpriley02

Member
Merit won't cut it. In hemlock, merit has been blamed for increased spider mite outbreaks. Horticultural oil works for many types of spider mites.
 

TreeDr

Active Member
I wish there was a soil injectable pesticide that took care of everything, but there isnt as of yet. The increased spider mite activity in hemlocks after being injected with merit, I personally think is false. It doesnt make sense to me.

Right plant in the right location works best for me.

We do use floramite with success, but repeated applications require you to switch to another miticide such as Avid as the mites will build a tolerance to one product.

As the last poster wrote, READ THE LABEL.

Good luck
 

mpriley02

Member
[ QUOTE ]
The increased spider mite activity in hemlocks after being injected with merit, I personally think is false. It doesnt make sense to me.


[/ QUOTE ]

I haven't seen it personally, but that's the rumor...
 

Morice

Member
If I remember correctly, I heard Dr. Raup say at the IPM short class @ University of Maryland a few years ago that Merit can actually make "super" spider mites,and I am paraphrasing...and I don't mean to speak for nor represent Dr. Raup...I'm no where near his level of expertise!
 

TreeDr

Active Member
My take on it is that people think Merit is a cure all. You still should get a pair of oils on hemlocks for the mites eggs or floramite for the adults.
 

Getreal

New Member
Merit has been known to increase spider mite populations. Remember that Merit is an insecticide and will not work to control Spider Mites and it also doesn't work well against your caterpillars. You need a miticide for spider mites. Spider mites and insects are two different beasts when it comes to control. Some manufacturers do have a miticide/insecticide but these are mostly non selective. Go with a miticide that won't wipe out the beneficial mites. Also remember to rotate your miticides so the mites do not become resistant. Some miticides are labled to only be used once per season so it is very important to read the label.
 

phasthound

New Member
When I used to use pesticides as the first line of defense, I found that Merit treatment increased mite out breaks in every type of plant that is prone to mites.

I have since come to respect the fact that mites are a symptom of plants in stress. Either it's planted in the wrong place or other factors are weakening them.

Now, rather than treat the symptom, we work on the problem. We've had success by improving the soil with organic matter, treating with hort oil, and other strategies.
 
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