&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 Collar Safety. If your veterinarian approves the use of a flea collar, there are important safety considerations to keep in mind. Your kitten must be more than 12 weeks of age. Use a flea collar with a breakaway buckle so your kitten can free himself without choking if the collar gets caught on something.