&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.
Flea Control and Flea Bite Allergies in Cats. Flea Bite Hypersensitivity in Cats. Flea bite hypersensitivity or flea allergic dermatitis is very common in cats. In fact, it is the most common skin disease to be diagnosed in pets. Flea allergies usually develop when cats are young (less than one and up to five years of age), but can begin at any age.