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Influence of changes of soil moisture due to the durations of irrigation on the development and reproduction of the root-knot (M. incognita) and the reniform (R. reniformis) nematodes infecting eggplant, squash and cowpea in two different soil types was studied under greenhouse conditions. Results showed that the highest counts of the root-knot nematode were recorded on roots of eggplant grown in loamy sand soil and irrigated at the fourth day. On squash, the highest nematode counts were recorded on plants grown in sandy loam soil and irrigated every day, and on cowpea roots grown in the same soil type but irrigated every four days. Higher reproductivity values of the reniform nematode on eggplant roots were accomplished in loamy sand soil and irrigated every four days. Significant higher final population and rate of reproduction on squash and cowpea were recorded on plants grown in the same soil type but irrigated daily or every other day, respectively. The influence of the duration of irrigation on nematode development depend on many factors most of which are the soil type, duration of irrigation, nematode species as well as the growing crop. The prolonging irrigation period (decreasing soil moisture) significantly reduced the growth of the infected plants. Such effect was pronounced with the longest period between irrigation (3 days) in loamy sand soil.

egyptian journal of agronematology

Effect of duration of irrigation on the infectivity and reproduction of the root-knot and the reniform nematodes on some vegetable crops grown in two different soil types