&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 collars don't work. They can actually cause skin irritation and other problems. Hartz products are by far the worst, and dogs have actually died from Hartz products.You need to give your dog a flea bath, and remove the ticks.lea collars aren't very reliable. And if it makes the fleas jump off your dog, it may not kill the eggs and flea larvae. If you bought a cheap collar, it may take hours before you see any results.