Contrac Blox Rodenticide is not labeled for possums but if they were to eat enough of it it could harm them. It doesn't sound like your stations are secure at all to the ground or to some other structure. You can use liquid nails and affix the station on a 1 x 1 foot paver you can buy from home depot. This well prevent them from being moved. Also, if you make sure the bait is secured on the rods, and the station is secure, it should prevent the possum from being able to work the bait free from the rods.
Contrac Blox Rodenticide should be applied in tamper-resistant stations to prevent non-target animals and children from accessing the bait inside. Although this product is only labeled for rats and mice, it is possible that a squirrel could be attracted to the bait matrix for consumption since squirrels are in the same family as rats/mice.
No, you do not need a license to use Contrac All-Weather Blox Rodenticide.
You should rotate Contrac All-Weather Blox Rodenticide every 4-6 months with a bait that has a different active ingredient to prevent resistance. Fastrac or Final are great options.
Contrac All-Weather Blox Rodenticide can be used indoors but only if they are secured in tamper-resistant bait stations. Using tamper-resistant bait stations keep kids and pets from accessing the bait but also, secures the bait blox to help with monitoring activity. If the bait blox are not secured, the rodents will take the blox to the nest, therefore, making it difficult to see if they are consuming the bait. I have included the instructions per the Contrac Blox product label regarding the number of blox that should be used over certain linear footage.
RATS: Place 3 to 16 bait blocks (at intervals of 15 to 30 feet) per placement in infested areas. Maintain an uninterrupted supply of fresh bait for at least 10 days or until signs of rat activity cease.
MICE AND MEADOW VOLES*: Place 1 block per placement. Space placements at 8- to 12-foot intervals in infested areas. Two blocks may be needed at points of very high activity. Maintain
an uninterrupted supply of fresh bait for at least 15 days or until signs of
mouse or meadow vole* activity cease.
The risk of secondary poisoning with Contrac Blox is very minimal. A rodent only consumes a very small amount of bait at a time and passes it very quickly only keeping a smaller amount in their liver until they succumb to the effects of the bait. For expample, a cat would have to actually eat 20-30 mice that have consumed the bait for it to have an effect. In most cases well fed domesticated animals will not actually eat a mouse or a rat that they come across. Instead they will play with it, chew it and then leave it behind.
For a rodenticide, we would recommend Contrac Blox. It is a single feed kill. It comes in an 18 lb. pail. We would recommend putting these in rat bait stations, such as Protecta Rat Bait Stations. If you are in CA, we would recommend Fastrac Blox. Although they are not a single feed kill, they still will work wonderfully.
For spiders, we would recommend using Bifen IT. This can be sprayed indoors and outdoors. It does have a residual of about 90 days indoors and 30 days outdoors. Indoors, it needs to be sprayed in the cracks and crevices and along the baseboards. Outdoors, this product can be used around the perimeter, in the lawn, on shrubs, trees and on flowers. This product should be used on edibles.
Yes, both the 4lb and 18lb buckets of Contrac Blox utilize the same label.
Unfortunately Contrac Blox is only labeled for rodents like rats and mice. Therefore we cannot recommend that it be used for ground squirrels. We do not have any products that are labeled for squirrels specifically other than live catch traps.
We do not advise using Contrac Blox Rodenticide to treat for moles as it is not labeled to used for that treatment. Moles' primary food source is actually earthworms, and they stay underground to feed, so it is unlikely they would even consume a bait such as Contrac. Please refer to our guide on How to get rid of Moles to help further asisst you.