They suck blood, causing swelling and itching. They leave odors and fecal leavings. Preventive measures include keeping bats and birds away from the home. I ve noticed a smelly, brownish fluid on the bark of my Magnolia tree. Generally it affects only trees that are ten years or older.
Gardenias prefer approx.
Fertilize for acid-loving plants during the growth season. You may see bud drop if the temperature is too high or if there is too little light or low humidity. Grapes require pruning every year during the winter dormant season in order to produce fruit. Technique varies between spur and cane varieties. 81-3 illustrate pruning strategies.