Impact of Three Organic Materials Either Alone or Integrated with Oxamyl on Meloidogyne Incognita Infecting Tomato Under Greenhouse Conditions

Abstract

A greenhouse experiment was conducted to determined the impact of three organic materials i.e. sesame grounded seeds and pigeon manure as pre-planting applications as well as salicylic acid as foliar spraying either alone or mixed with oxamyl at their half doses each on M. incognita infecting tomato plant cv. Alisa comparing with oxamyl at the recommended dose under greenhouse conditions (27±3 o C). Pigeon manure alone or mixed with oxamyl at half doses overwhelmed other treatments in the increment values for total plant growth parameters and accomplished the highest percentage reduction of final nematode population, (95.4%), number of galls (93.7%), and egg-masses (94.4%), respectively. It is interesting to note that no significant deference between the three double treatments tested in plant length values that were amounted to 57.29, 57.29 and 54.16% for pigeon, salicylic acid and sesame plus oxamyl each at their half doses comparing to nematode alone. Nematode reproduction factors under the stress of sesame grounded seeds, pigeon manure and salicylic acid solely or mixed with oxamyl at their half doses each in comparing with oxamyl were adversely affected. Such rates ranged between 0.07-0.14 vs 2.41 for nematode alone. It was evident that N, P, K and OM concentrations were obviously reduced by nematode infection. All tested components specially pigeon manure plus oxamyl as pre-planting application showed remarkable increase in N, P, K, and OM concentrations exceeding those of nematode alone.