&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 and Tick Control Supplements. There are a number of multi-benefit supplements available that are made for use on both cats and dogs that will combat fleas naturally. Yeast and garlic have been shown to be very effective in driving fleas and ticks off of the host organism, in this case, you cat or dog.