&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.
Feline Fleas. Fleas are the most common external parasite on cats. An adult flea is brown, wingless, has eight legs and a hard body. Flea dirt, or feces, are small black spots on a cat's skin and flea larvae are small, white specks in a cat's hair. The most common areas to see fleas are on the back, around the tail and the hindquarters.