Abstract
Efficacy of neem leaf based compost andTrichoderma harzianum solution were assessed on root knot nematode pest of two cowpea varieties at the screen house of the International Institute of Tropical Agriculture (IITA), Ibadan during 2012 planting season. The two cowpea varieties which have been confirmed to be susceptible to root knot nematode, IT96D-610 and IT84S-2246-4 were the test crops. The experimental pots (10kg soil) were inoculated with 5,000 root knot nematode eggs. The treatments were neem compost and T. harzianum solution with application rates of 2 ton/ha and 1x10-7 spores respectively. The pots that were not treated served as the control. Each treatment was replicated 4 times while the statistical design was complete randomized design. Data were collected on the growth and yield of cowpea, and also on the nematode populations in the soil and cowpea root. The results indicated that neem compost and T. harzianum solution significantly increased the growth and yield of IT96D-610 and IT84S-2246-4 cowpea varieties grown in the root knot nematode inoculated soil. The populations of root knot nematode in the soil and cowpea root were significantly reduced. The level of root damage (root gall) was significantly reduced in the neem compost and T. harzianum treated cowpea when compared with the untreated control.
Highlights
Cowpea (Vigna unguiculata (L.) Walp) is an important food legume and essential component of cropping system in the drier region of the tropics and subtropics (Singh et al, 2003), and it is important livelihood of millions of people (Quin, 1997)
Watering,manual weeding nematicides have motivated researchers to exploit and insect control using Cypermethrin 10% EC were alternative way of controlling nematode infection.It is in done whenever necessary. This regard that nematologistsespecially in the Data were collected on plant height, number of leaves, developing world tend to look for indigenous, non- seed weight, fresh and dry root weights, gall index, initial expensive but effective method of nematode control and nematode population and final nematode populations
The two cowpea varieties which have been confirmed to variety that were treated with Trichoderma harzianum be susceptible to root knot nematode, IT96D-610 and had the highest number of leaves followed by those
Summary
Plant parasitic nematodes is a serious pest and constitutes a major production constraint to cowpea in most growing areas of the world (Sikora et al, 2005; Sikora and Geco, 1990). The root knot nematode Meloidogyne incognita and M. javanica, are documented to cause major losses, with M. incognita indicated to be the most detrimental species to cowpea (Sarmah and Sinha, 1995). Watering,manual weeding nematicides have motivated researchers to exploit and insect control using Cypermethrin 10% EC were alternative way of controlling nematode infection.It is in done whenever necessary. This regard that nematologistsespecially in the Data were collected on plant height, number of leaves, developing world tend to look for indigenous, non- seed weight, fresh and dry root weights, gall index, initial expensive but effective method of nematode control and nematode population and final nematode populations.
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