from English Grammar Today. Efficient and effective are adjectives. We use efficient to describe something or someone that works in a quick and organised way: The new online banking system offers a convenient and efficient way to check your account. [extract from a reference for someone applying for a job]
Main Disease. Oak wilt is caused by the fungus Ceratocystis fagacearum which develops in the outer sapwood of the tree. The infected tree reacts by developing tyloses and gums which subsequently restrict the flow of water and nutrients in affected vascular tissues with the result that the tree wilts and subsequently dies (French & Stienstra, 1980). Host Range.
This type of succession proceeds in the same way as primary succession except that the pioneer species tend to be grasses and fast growing plants. An example of secondary succession forming an oak woodland: 1  Bare soil is colonised by grasses and pioneer plants. 2  Grasses begin to predominate with time. 3  Shrubs replace the grasses. 4  Fast growing trees appear. 5  Slow growing oaks create the climax community.