The hops will turn brown if they are not picked in time. There are some obstacles that will affect the hops. The most common enemy is the Japanese beetle. Luckily there are beetle traps available. Rose bushes attract these little monsters so it is important that rosebushes are not kept near the vineyard.
Aphids are another common problem but pesticides can solve that problem.
Mold can be problem if the hops are not stored in a dry tight area. German Hops Prowess Germany is a very important country in terms of production and taste of hops. Spalt has been growing hops for over 1000 years. The mild climate of rain and sun are ideal for the development of hops unique aroma. Anheuser Bush, the world's biggest brewer, counts on Germany for hops.