Greasy spot of citrus, caused by Zasmidium citri-griseum (= Mycosphaerella citri), is widely distributed in the Caribbean Basin, inducing leaf spots, premature defoliation, and yield loss. Greasy spot-like symptoms were frequently observed in humid citrus-growing regions in Panama as well as in semi-arid areas in Spain, but disease aetiology was unknown. Citrus-growing areas in Panama and Spain...

Pathogens interaction with a host plant starts a set of immune responses that result in complex changes in gene expression and plant physiology. Light is an important modulator of plant defense response and recent studies have evidenced the novel influence of this environmental stimulus in the virulence of several bacterial pathogens. Xanthomonas citri subsp. citri is the bacterium responsible ...

Weexamined the propensity for ßight initiation and ßight capability of the Asian citrus psyllid (Diaphorina citriKuwayama, Hemiptera: Liviidae)with a ßightmill.Wemeasured continuous ßightbyD. citri forup to3h,whichequated toadistanceof 2.4km.Wecompared theßight capability ofD. citridependingon their sex andmorphotype(colorof abdomen).Twogeneralmorphotypes exist within this species: greenÐblue a...

An antipredator defence in the citrus red mite Panonychus citri, which does not produce protective webs, was examined experimentally. P. citri adult females lie down on citrus leaf surfaces with their dorsal setae (hair) directed in all upper directions. They seldom move in response to physical stimuli. Compared to normal lying females, both manipulated non-lying females and hair-removed female...

Two bioactive cyclic dipeptides, cyclo(L-Pro-L-Tyr) and cyclo(D-Pro-L-Tyr), were isolated from the culture broth of Streptomyces sp. strain 22-4 and tested against three economically important plant pathogens, Xanthomonas axonopodis pv. citri, Ralstonia solanacearum and Clavibacter michiganensis. Both cyclic dipeptides were active against X. axonopodis pv. citri and R. Solanacearum with MIC of ...

Strains of Spiroplasma citri are persistently infected by viruses which have been separated into three groups on the basis of their morphology. The properties of each group are reviewed. Viruses normally only appear in spiroplasma cultures but recently all three types of particle have been identified in cells of a single strain of S. citri within an infected plant. Replication of a short-tailed...