Impact of Bacillus subtilis, Trichoderma spp. and The Bioproduct Top Perfect on Meloidogyne incognita Infecting Pepper Plants

Abstract

Root-knot nematodes are considered one of the severe plant pathogens that can be managed effectively with chemical nematicides in spite of their hazards to humans and the environment. Our work focus on the efficacy of Bacillus subtilis, Trichoderma spp. culture filtrates, the bioproduct Top perfect and the nematicide Vydate ® L 24% for controlling Meloidogyne incognita infecting pepper plants cv. Balady. Under laboratory and greenhouse conditions, treatments with 0.025 and 0.05 μl of Vydate ® L 24%/ml distilled water caused the highest reductions ranging from 83.9-99% in nematode egg-hatching and increased 2 nd stage juveniles' mortality; the number of root galls and egg masses, followed by treatments with the (100 μl/ ml, 10 ml/200 cc soil and 50 ml/ kg soil) of B. subtilis, Trichoderma culture filtrates, and the bioproduct Top perfect which showed 60.4-79.8 % inhibition. Meanwhile, treatments with the low doses (50 μl/ ml, 5 ml/200 cc soil and 25 ml/ kg soil) of B. subtilis, Trichoderma culture filtrates and the bioproduct, Top perfect resulted in 23.5-59.6 % inhibition in nematode parameters compared with the check treatment. In comparison to check treatment under greenhouse conditions application of Vydate ® L 24% showed a 60.2-77.8% increase in growth parameters of pepper plants, followed by both treatments with high and low doses of B. subtilis, Trichoderma culture filtrates, and the bioproduct Top perfect which showed 43.1-58.8% and 29.7-42.0% increase, respectively. Tested biocontrol agents could achieve various degrees of root-knot nematode control on pepper plants infected with M. incognita under laboratory and greenhouse conditions.

Combined treatment with Purpureocillum lilacinum MTL01 and Bacillus velezensis 83 reduces galling by Meloidogyne enterolobii and improves flowering in greenhouse-grown tomato

“…On the other hand, bacteria of the Bacillus genus are well-known plant growth promoters and are also effective in biological control of different pests. Reports exist of suppression of Meloidogyne populations by Bacillus subtilis in chili (Capsicum annuum) (Mokbel et al, 2022;Soto Deza et al, 2012) and tomato (Basyony and Abo-Zaid, 2018), while BMH and INV strains of a Bacillus species related to Bacillus velezensis, reduced the number of galls and eggs of M. incognita by more than 90% in tomato (Cruz-Magalhães et al, 2022). Tian et al, (2022) reported that B. velezensis Bv25 reduced galls caused by M. incognita on cucumber roots by 73.8%, through root colonization and production of volatile compounds.…”