&middotDrought damage - needles gradually turn yellowish-green and then light brown. This starts at the top of the tree and progresses downward and from the outside in. &middotAnimal injury - dog urine can cause some browning and dropping of lower branches on arborvitae and junipers.
There are many different brands of cat flea collars. Generally, flea collars work by either emitting a toxic gas to the local area (head/neck of the pet) or by exuding chemicals that are absorbed into the animal's skin. Some flea collars have an Insect Growth Regulator (IGR), to prevent development of cat fleas, eggs and larvae.
Ask your vet where on your cat to put the product, how much to apply, and how often to use it. If youâre not getting the treatment from your vet, read the product label first to make sure it's safe for cats. A flea collar with flumethrin and imidacloprid (Seresto) can also work well.