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.
SYMPTOMS AND SIGNS. The fire blight pathogen can invade all parts of the pear tree. Shoots, flowers, and fruits wilt, blacken, and die. Shoot tips exhibit the typical shephards crook. If infections are not removed, the entire tree may be killed as the disease spreads into the main scaffolds, trunk, and roots.