&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 shampoos and dips are effective for adult fleas. Flea collars. Flea collars work one of two ways-by emitting a toxic (to fleas, anyway) gas, and by being absorbed into the animal's subcutaneous fat layer.The toxic gas is usually only effective in the immediate area of the head and neck.hampoos and dips. A shampoo, or flea bath is a good first attack on fleas for the pet that has large numbers of fleas visible on its body. Cats can be difficult to bathe. It is important to know how to properly use the medicated shampoo to effectively rid your pet of fleas.