Interactions between rate, spray interval and number of applications of the synthetic pyrethroid Decis in cow pea (<i>Vigna unguiculata</i>) pest control

Dina, S. O.

doi:10.1017/s0021859600031129

Cited by 6 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pod sucking bugs particularly C. tomentosicollis were abundant (over 5 bugs/m row) at both locations. The observations of PSBS in the two locations agree with the report of Dina (1982) and IITA (1983) that pod sucking bugs occur abundantly during the late planting season. For meaningful grain yield in these areas, damage to pods and seeds by PSBS, must be checked because uncontrolled infestation of these insects have been reported to cause cowpea losses in the magnitude of 80% and 95% for pod and seed yield respectively (Ogunwolu and Ekefan, 1991).…”

Section: Resultssupporting

confidence: 90%

Effect of two agro-ecological zones on insect species of cowpea (Vigna unguiculata L.) Walp during the late cropping season, Delta State, Southern Nigeria

Egho¹

2011

ABJNA

View full text Add to dashboard Cite

The study was conducted in two agro-ecological zones to identify and compare insect species associated with cowpea (Vigna unguiculata (L.) Walp Delta State during the late cropping season of 2005. Asaba in Oshimili South Local Government Area of Delta State lies in the northern drier part of Delta State, south Nigeria while Abraka in the same state is located in the south and experiences a more humid weather. Both locations are about 135 kilometres apart. The results showed that the occurrence and distribution of insect species followed different trends. There were 10 insect orders, 24 families and 39 species in Asaba while Abraka recorded 8 insect orders, 23 families and 35 insect species. The heteroptera with relative abundance of 28.2% were the dominant species at Asaba, while coleoptera (28.6%) were the most dominant species at Abraka in the late season. Orthoptera (8.6%) were slightly more at Abraka than Asaba with 5.1% relative abundance. Nine insect species recorded at Asaba were absent at Abraka. Conversely, four insect species on the crop at Abraka were absent in Abraka. Ootheca mutabilis Sahl, Aphis craccivora Koch, Megalurothrips sjostedti Trybom, Maruca vitrata Fab and coreid bugs such as Clavigralla tomentosicollis Stal, Anoplocnemis curvipes Fab, C. shadabi Doll, Aspavia armigara Fab, Nezara virudula, Mirperus jaculus were the key insect pests in the study areas. More insect species occurred in Asaba compared to Abraka.

show abstract

Section: Resultssupporting

confidence: 90%

Effect of two agro-ecological zones on insect species of cowpea (Vigna unguiculata L.) Walp during the late cropping season, Delta State, Southern Nigeria

Egho¹

2011

ABJNA

View full text Add to dashboard Cite

show abstract

“…The more population of PSB's in the late season than early as indicated in the result was consistent with IITA (1983) that recorded high infestation of coreid bugs in the late season. The study also agreed with Dina (1982) who observed high infestation of coreid bugs in the late season in Ibadan.…”

Section: Discussionsupporting

confidence: 91%

Management of major field insect pests and yield of cowpea (Vigna unguiculata (L) walp) under calendar and monitored application of synthetic chemicals in Asaba, southern Nigeria

Egho¹

2011

AJSIR

View full text Add to dashboard Cite

The management of major field insect pests of cowpea under calendar and monitored sprays of cypermethrin was studied. The major insect pests studied were the cowpea aphid, Aphis craccivora Koch, legume bud thrips Megalurothrips sjostedti Tryb, legume pod borer, Maruca vitrata Fab. and pod sucking bugs. Influence of insect pest management on yield was also determined. The calendar sprays consisted of 7 days' spray intervals carried out 5 times and 10 days' spray intervals, carried out 4 times. Monitored spray was carried out only when insect pest infestation/damage reached or exceeded the action threshold. The experiments were conducted in the Teaching and Research Farms of the Agronomy department, Asaba Campus, Delta State University, Nigeria. Comparison of insect pests and grain yield from the calendar and monitored spray treatments was made if differences existed among them. Results indicated that all the cypermethrin treatments effectively controlled M. sjostedti, M. vitrata, flower bud thrip population and pod sucking bugs when compared to control in the early season. There was however, no significant difference (P>0.05) in calendar and monitored sprays. Similar observation was made for grain yield. In the late season, all treatments significantly (P<0.05) controlled pest population/damage on cowpea. Grain yield increase was similarly recorded but no differences among the treatments. Cowpea growers sometimes apply insecticides as many as 8 to 10 times to control insect pests during the growing season; the study here provides evidence (1) that 10 days' interval spray and monitored spray can be as profitable as 7 days' interval spray in cowpea production and (2) this could reduce the number of chemical application, save cost as well as environmental pollution and hazards to consumers.

show abstract

“…The absence of A. craccivora may be due to heavy downpour during this season at Asaba and this could have washed away aphid colonies from the plant. This observation is in agreement with the reports of Dina (1982), Digri and Hadi (2000) and who recorded low aphid infestation in rain fed experiment.…”

Section: Discussionsupporting

confidence: 94%

Mineral oils: Non-conventional chemicals in the control of insect pests and yield of cowpea (Vigna unguiculata (L) WALP) at Asaba and Abraka during the early season, Delta State, Nigeria

Egho¹

2011

AJSIR

View full text Add to dashboard Cite

Mineral oils are refined petroleum products. They have been employed as contact insecticides to control insect pests on various crops in many parts of the world. Three types-premium motor spirit (PMS), dual purpose kerosene (DPK) and automotive gas oil (AGO) at 0.4% were evaluated to assess their efficacy in the control of major insect pests of cowpea in two locations-Asaba and Abraka, Delta State. Influence of pest control on grain yield was also determined and comparison of the two agro-ecological zones in terms of insect species and yield was made. The study was conducted at both locations during the early cropping season (May-July) of 2005. The experiments were conducted at Asaba in the Teaching and Research Farm of the Agronomy Department, Delta State University while at Abraka on a piece of land about 100 metres to Campus 2 of Delta State University, Abraka. The experimental design was a randomised complete block design with five treatments and three replications. The results indicated that all the tested mineral oils effectively controlled M. sjostedti at 0.4% concentration. Similarly, M. vitrata was subdued by PMS and AGO at both locations. Grain yields were high in the two locations; however, Abraka yields were significantly (P<0.05) higher than Asaba. The present study provides the evidence that mineral oils are suitable bio-chemicals for cowpea insect pests control in Nigeria and should be tested further so that it could be incorporated into the pest management programme.

show abstract

Interactions between rate, spray interval and number of applications of the synthetic pyrethroid Decis in cow pea (Vigna unguiculata) pest control

Cited by 6 publications

References 2 publications

Effect of two agro-ecological zones on insect species of cowpea (Vigna unguiculata L.) Walp during the late cropping season, Delta State, Southern Nigeria

Effect of two agro-ecological zones on insect species of cowpea (Vigna unguiculata L.) Walp during the late cropping season, Delta State, Southern Nigeria

Management of major field insect pests and yield of cowpea (Vigna unguiculata (L) walp) under calendar and monitored application of synthetic chemicals in Asaba, southern Nigeria

Mineral oils: Non-conventional chemicals in the control of insect pests and yield of cowpea (Vigna unguiculata (L) WALP) at Asaba and Abraka during the early season, Delta State, Nigeria

Contact Info

Product

Resources

About