Digest: potential for biological control of Cuscuta spp. and Orobanche spp.
Information on insects and plant pathogens of potential interest as biological control agents of Cuscuta and Orobanche spp. is reviewed, followed by an account of biocontrol attempts conducted to date. Among the insect species found associated with Cuscuta europaea, C. lupuliformis and especially C. reflexa were Melanagromyza cuscutae, the curculionids Smicronyx spp. and the tortricid Herpystis cuscutae. Examples of fungal pathogens were Alternaria cuscutacidae infecting C. capulata and C. campestris, Colletotrichum destructivum isolated from C. epithymum and C. campestris and C. gloeosporioides f. sp. cuscutae. The main insect species attacking Orobanche spp. was the agromyzid Phytomyza orobanchia. The fungus Fusarium oxysporum var. othoceras and P. orobanchia showed promise as potential biocontrol agents of Orobanche ramosa and O. cumana.