&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.
Vagabonds & Hitchhikers. Even though your cat is strictly indoors, he can get fleas via indoor-outdoor pets, outdoor animals at a window or from your clothes. Tiny, brown and wingless fleas are pint-sized jumpers whose patronage breeds itchy discomfort. The cat flea, ctenocephalides felis, is the most common external parasite in cats and dogs.