A review on nematodes and their management in tuberose
Kayalvizhi K, Ramesh Kumar A, Sankari A
Tuberose (Polianthes tuberosa L.)is one of the most important flowers used both as cut and loose flower. It is extensively cultivated in many sub-tropical and tropical parts of the world including India. It is a crop which flowers profusely throughout the year. Due to the longer keeping quality of flower spikes, they are in great demand for making floral arrangement and bouquets. However, the yield loss is huge due to several problems which is a serious cause of concern. Nematode are the thread like worms, predominantly survives in plant rhizosphere, posing threat to tuberose cultivation. Nematodes viz., root-knot nematode (Meloidogyne incognita and M. javanica) and reniform nematode (Rotylenchulus reniformis) and greasy streak caused by Aphelencoides besseyi have been reported to be responsible for complete wiping out of tuberose flower industry. The symptoms of nematode infestation in broadly categorized as above ground and below ground symptoms. The management strategies include, hot water treatment of bulbs, use of neem cake, use of neem seed kernel extract, use of bio-control agents, nematicide application, genotype screening, mutation induction etc are recommended scientifically. In this review paper the magnitude of nematode problems, symptoms and management measures are discussed in a holistic manner.