Potential Use of Botanicals Rich in Alkaloids for Controlling Meloidogyne incognita and Rotylenchulus reniformis Infecting Cucurbits

Abstract

Two greenhouse experiments were conducted to evaluate the nematicidal activity of certain alkaloid plants namely, periwinkle (Catharanthus roseus), datura (Datura stramonium), lupin (Lupinus albus), pomegranate (Punica granatum) and fenugreek (Trigonella foenum-graecum) against root-knot nematode Meloidogyne incognita infecting cucumber (Cucumis sativus) and reniform nematode (Rotylenchulus reniformis) infecting cantaloupe (Cucumis melo var.cantaloupensis). Dried powdered parts of such plants were screened at three rates (1, 3 and 5g / plant). In most treatments data indicated a positive correlation between tested rates and plant biomass. Dried leaf powder of C. roseus (62.5%) as well as dried seed powder of L. albus ( 52.8%), and T. foenum-graecum ( 43.2 %) induced remarkable improvement in total plant fresh weight of cucumber at the rate of 5g/plant. However, dried leaf powder of D. stramonium (41.4%) recorded a significant increase in total plant fresh weight at the rate of 3g/plant. By all treatments of alkaloid plants root-knot nematode population whether in soil and roots, root galling and number of egg masses were significantly suppressed. Dried leaf powder of C. roseus at three tested rates (71.8, 71.6 and 72.6%) performed the best and suppressed total nematode population of M. incognita followed by T. foenumgraceum at 5g/plant (70.1%). On the other hand, a slight to moderate improvement in plant growth parameters of cantaloupe infected with R. reniformis was indicated in pots receiving alkaloids plants. The highest percentage of increase in total plant fresh weight was noticed with dried leaf powder of C. roseus at three tested rates (28.5, 31.4 and 32.6%) respectively. The best protection of cantaloupe against R. reniformis was recorded with dried seed powder of T. foenum-graecum (57.9, 65.2 and 75.0%) and P. granatum (55.4, 55.9 and 61.7%) at three tested rates, respectively which ultimately suppressed R. reniformis population.

Nematicidal Activity of Jimson Weed (Datura Spp.) for Management of Plant-Parasitic Nematodes With Emphasis on Root Knot Nematode: A Review

“…Recorded results illustrated that the lowest galling index and nematode population recorded in plants treated with 15 g of D. Stramonium in comparison to the untreated control plants ( Umar and Ngwamdai, 2015). Mostafa et al, (2016), tested the nematicidal effect of dried powder of D. stramonium at 1,3 and 5 g/plant against root-knot nematode M. incognita infecting cucumber (Cucumis sativus). The dried leaf powder of D. stramonium significantly suppressed the root-knot nematode population in soil and plants root, root galling and number of egg masses.…”

Efficiency of Humic Acid and Three Commercial Biocides Against Meloidogyne incognita and Tylenchulus semipenetrans Associated with Olive Plants

“…However, because chemical pesticides are dangerous to human health and pollute the environment, there is a growing need to develop efficient nematode control methods that do not rely on them. Biocontrol, whether by using crucial enemies such as fungi or bacteria (Ibrahim et al, 2020 andSoliman et al, 2021), organic additives (Mostafa et al, 2016 andEl-Deriny et al, 2020), and elements that boost plant resistance are all key approaches to tackle nematodes (Ibrahim et al, 2021, Nagachandrabose andBaidoo, 2021).…”