&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.
Seresto Flea and Tick Collar for Dogs, For Large Dogs. 1  Seresto flea collars for dogs provide completely safe and odorless pest protection. 2  Eliminates and prevents fleas, ticks and larvae for up to 8 months. 3  Adjustable size allows for a custom fit. 4  Breakaway flea and tick collar for dogs with 3 visibility reflectors for safety.