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.
Oak groups. Oaks are usually divided into two groups: red-black oak group. and white oak group. Some problems of oaks are restricted to or. are more severe in one group versus the other. It is therefore. important to know to which group an oak belongs. Leaf shape is. the simplest way of telling one from the other. Red-black oak group (top image): Leaves have pointed lobes.