Effect of Different Levels of IBA and Methods of Application on Rooting, Survival and Growth of Success Air Layers in Guava (Psidium guajava L.)

Guava is also propagated vegetative through inarching, layering, cutting, budding and grafting. But layering and that too air-layering remains the best method of propagation for this crop. The use of plant growth regulators to increase the efficacy of propagation in cutting and layering are now common and moreover, use of growth regulators has opened a new vista for nurserymen for propagating fruit trees. Growth substances accelerate the rooting, produce a large root system and increase the percentage of survival. Growth regulators like IAA, NAA and IBA have been used tostimulate plant growth and specially root formation in layering. IBA has been found to be most effective in producing maximum number of roots with better vigour. For air-layers, the rooting media like sand, soil, peat moss, compost, farm yard manure, coconut pith, sphagnum moss are used.