Performance of ‘Valencia’ Orange (Citrus sinensis [L.] Osbeck) on 17 Rootstocks in a Trial Severely Affected by Huanglongbing
‘Valencia’ orange (Citrus sinensis [L.] Osbeck) was grown on 17 rootstocks through seven years of age and the first four harvest seasons in a central Florida field trial severely affected by huanglongbing (HLB) disease. All trees in the trial had HLB symptoms and were shown by PCR to be infected with Candidatus Liberibacter asiaticus (Las). Large differences were noted between rootstocks for many metrics examined, including yield, fruit quality, and tree size.
Black knot (Apiosporina morbosa), is a striking disease and a major disease of plum trees in Michigan. Black knot appears on the woody parts of the tree including twigs, limbs and sometimes the trunks. Black knot attacks plums, wild cherries and some ornamental cherries. Cultivated sweet and sour cherry trees are seldom attacked in Michigan. Black knot is found throughout Michigan in commercial and home orchards and in wild plum and cherry thickets.
Disease pictures and control methods are discussed.
Relative to total sales, blueberries are the number one fruit commodity in the state of Georgia, surpassing even peaches. Recently, a new disease has been identified in the Georgia blueberry production region. This disease has been named “bacterial leaf scorch,” and it is caused by the bacterium Xylella fastidiosa.
Estado fitosanitario del azafrán en Aragón (España): insectos, ácaros, nematodos, virus, bacterias y malas hierbas
Symptoms of the disease can be mistaken by nutritional problems since they manifest as a yellowing or browning of leaves. However, if the abaxial side of the leaf is inspected, profuse, dark sporulation will be covering the surface of infected leaves. Usually, the sporulation is obvious enough that it can be seen without a microscope or hand lens, however, when you take a closer look at the sporulation on the leaf with a hand lens or dissecting microscope, you will be able to see the typical sporangiophore structures bearing sporangia found in downy mildew pathogens