Biological control of phytoparasitic nematodes in sugarcane fields

Abstract

The management of nematode infested areas includes several measures, among which chemical nematicides are the most used. However, since their use is associated with environmental impacts, researches with biocontrol agents have acquired a greater importance. This study aimed to evaluate the performance of Bacillus subtilis + B. licheniformis, when applied to the planting furrow, on nematode control and its effects on sugarcane yield. Five experiments were carried out in infested areas, with four treatments: control - no nematicide; carbosulfan 700EC 4 L ha-1 - standard treatment; B. subtilis + B. licheniformis at 0.16 kg ha-1 and 0.20 kg ha-1. Carbosulfan was more efficient in controlling the nematodes, reducing the populations at least four months after planting. The treatments with B. subtilis + B. licheniformis were more effective in the control of Meloidogyne javanica, when compared to Pratylenchus. The plots treated with carbosulfan produced 11 % more than the control. There was no difference between the B. subtilis + B. licheniformis doses, in relation to yield. The plots treated with the biological product produced 5 % more than the control.

Biocontrol Potential of Bacteria Isolated from Vermicompost against Meloidogyne incognita on Tomato and Cucumber Crops

“…The action mechanism of Bacillus in controlling plant root-knot nematodes is (1) to compete for nutrients and space; (2) to alter the action mode of root exudates and nematodes; (3) to produce toxic substances that are fatal for root-knot nematodes; and (4) to generate secondary metabolites that inhibit egg hatching and larval development [44]. Currently, Bacillus has been isolated and screened for the control of root-knot nematodes, including Bacillus thuringiensis [38], Bacillus amyloliquefaciens [45], Bacillus subtilis [46], Bacillus simplex [47], Bacillus firmus [48], Bacillus pumilus [49], Bacillus mycoides [50], and Bacillus megaterium and Bacillus cereus [9]. Peribacillus frigoritolerans is a multifunctional strain with the characteristics of preventing and controlling soil-borne diseases, promoting plant growth, and tolerating low temperature and saline-alkali environments [51].…”

Mass Spectrometry-Based Investigation of Sugarcane Exposed to Five Different Pesticides

“…Both compounds were previously tested in different varieties of sugarcane and an increment of 10% and 5% was also observed. The authors explained these differences by measuring levels of nematode infestation, which indicate the efficiency of pesticides applied in the studies [39,40]. Carbamates penetrate into the phytoparasite nematode and induce changes in metabolism leading them to death [41].…”