&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.
Allergies to fleas are the leading cause of skin problems in cats and dogs. Most pets suffering from flea-related skin problems will not have large numbers of fleas on their bodies, because these animals groom themselves tirelessly to remove fleas. Fleas contribute to a number of other health problems in cats and dogs. As well, they carry a wide variety of diseases that can affect pets and people. Contrary to popular belief, flea infestation is not contagious. Rather, in endemic areas fleas are ubiquitous in the environment.