Management of Meloidogyne javanica in Okra Using Compost of Pequi Fruit Waste

Abstract

Pequi waste added to soil can lead to promising results in the management of plant nematodes. This study evaluated the effect of organic compost of pequi fruit waste in the control of Meloidogyne javanica in okra plants. The compost was comprised of cattle manure, sugarcane straw, and pequi rind waste in the ratio 1:1:1. Treatments were five doses of organic compost (0, 5, 10, 20, and 30 g dm -3 ) and two additional controls: manure (20 g dm -3) and mineral fertilizer (100 mg dm -3 of N), arranged in randomized block design with 10 repetitions. Different treatments were incorporated into pots containing 3 dm -3 of sandy soil infested with 5,000 eggs of M. javanica. Seedlings were transplanted five days later, and evaluated after 60 days of transplanting. Organic compost with pequi waste incorporated to soil increased shoot dry weight and root weight, and reduced the number of egg masses, galls and eggs of M. javanica per gram of root, and reproduction factor. Doses of 20 and 30 g dm -3 increased plant development and reduced the reproductivity of M. javanica compared to mineral fertilizer.

Secondary metabolites related to the resistance of Psidium spp. against the nematode Meloidogyne enterolobii

“…Some studies have shown that tannins reduce the hatch rate, inactivate Meloidogyne spp. and consequently reduce the number of galls [ [44] , [45] , [46] , [47] ].…”

“…Seedlings of P. guineense (resistant to the nematode) [ 42 ], of P. guajava cv. Paluma (susceptible to the nematode) [ 44 ] and of P. cattleianum (immune to the nematode) [ 46 ] were obtained by germinating seeds in a greenhouse at Embrapa Semiarid, Petrolina, PE (Latitude: 9°09′S, Longitude 40°22′W, at an altitude of 365.5 m) with proper cultural practices.…”