Influence of Some Inert Diluents of Neem Kernel Powder on Protection of Sorghum Against Pink Stalk Borer (Sesemia Calamistis, Homps) in Nigerian Sudan Savanna

Okrikata, Emmanuel; Anaso, C. E.

doi:10.2478/v10045-008-0019-4

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…A very important finding of this study is that the RD used affects S. zeamais in ways similar to commercial DE formulations. The death of insects caused by DEs could be attributed to dehydration provoked by the abrasiveness of the small particles of this inert dust and by adsorption of oils from the body of the insects (Fields and Korunic, 2000;Kavallieratos et al, 2006;Okrikata and Anaso, 2019), which breaks the layer of wax on the epicuticle, exacerbating the fatal loss of water as reported by Subramanyam and Roesli (2000), and Okrikata and Anaso (2008). Ibrahim et al (2012) observed that DE reduced the production of progenies by ovicidal and larvicidal activities, increasing adult mortality and, reducing oviposition.…”

Section: Resultsmentioning

confidence: 98%

Management of <I>Sitophilus zeamais</I> Motschulsky (Coleoptera: Curculionidae) using Nigerian Raw Diatomite

Medugu¹,

Okrikata²,

Dunuwel³

2020

jasem

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Maize weevil, Sitophilus zeamais, whose management has largely been via traditional control practices, is a key pest of stored maize grains causing severe losses. This study explored the use of Nigerian Raw Diatomite (RD) in the management of the weevil. A 3-replicated split plot designed laboratory experiment was conducted for 6 months duration. The treatments were Raw Diatomite (RD) at the rate of 250, 500, 750 and 1000 mg/kg and a control (untreated) across four improved maize grain varieties. Data collected were on mortality, F1 progeny produced, grain weight damage, and loss. Data were analyzed with variance analysis and significantly different means were separated using Turkey Kramer HSD test at P<0.05. Results showed that the control had the least weevil mortality across the varieties throughout the periods of assessment. Highest weevil mortality was recorded with increase in dose rates of RD and progresses to 100% - largely at the 14th day post-treatment. Control recorded the highest weight loss and grain damage of 16.5% and 38.1%, respectively when compared to all the other treatment rates on the most tolerant variety (SAMMAZ 25). The study revealed that RD had a promising potential to substitute synthetic insecticides and can be incorporated into the integrated pest management strategy against maize weevil. We therefore suggest that further work be done to refine the Nigerian RD so as to standardize the most effective dosage application rate for management of insect pests of stored maize and other cereals. Keywords: Raw Diatomite, Sitophilus zeamais, Maize grain damage

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Section: Resultsmentioning

confidence: 98%

Management of <I>Sitophilus zeamais</I> Motschulsky (Coleoptera: Curculionidae) using Nigerian Raw Diatomite

Medugu¹,

Okrikata²,

Dunuwel³

2020

jasem

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“…Peduncle damage occurs during the advanced stage of the crop. Since application of treatments into the funnel of sorghum stops at the booting stage, it is obvious that the ability of the neem based treatments to suppress peduncle damage could be due to some level of persistence and systemic action (van den Berg and van Rensburg, 1991;Okrikata and Anaso, 2008). (Adane and Asmare, 2006;Chunshan et al, 2011) reported the very high efficacy of neem products in controlling stemborer infestations.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Neem Dust Formulations for the Control of Sorghum Stemborers in the Semi-Arid Zone of Nigeria

Okrikata¹,

Anaso

2019

Int. J. Adv. Biol. Biomed. Res.

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Sorghum stemborer species remains key yield limiting factor for sorghum production in the Nigerian semi-arid region. When they can afford, farmers rely almost solely on synthetic insecticides for control. Owing to the misuse and environmental and health challenges attributed to the use of synthetic insecticides, a two-year field study was carried out at the University of Maiduguri Research Farm to evaluate the efficacy of various neem dust formulations for the control of Sorghum stemborers. The experimental design was Randomized Complete Block Design and various neem dust formulations were compared with carbaryl dust and the control (untreated). All the insecticidal treatments significantly (p<0.05) reduced stalk and peduncle damage caused by stemborers with a resultant increase in grain yield when compared with the control. Neem Kernel Powder (NKP)+Finesand proved more superior in efficacy than all the other insecticidal treatments in checking stemborer damage.

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“…The proportion and severity of leaves injured were computed from randomly selected leaves (10 leaves/plot) at 50% vegetative, 50% flowering, and 50% fruiting stages and pooled using the method described by Okrikata and Anaso (2008) and Okrikata et al (2020) wherein leaves were scaled 0 -4 for severity of injury: 0 (0% leaf injury), 1 (1 -25% leaf injury), 2 (26 -50% leaf injury), 3 (51 -75% leaf injury), 4 (76 -100% leaf injury). Scores obtained per plot were then converted to Attack severity (%) by the equation; Where: ∑ n = summation of individual injury scores/plot, N = number of scores taken/plot (= 10), and 4 = highest score on the scale.…”

Section: Assessment Of Leaf Injury and Growth Indicesmentioning

confidence: 99%

Impact of doubling the recommended dose of Magicforce (Lambda-Cyhalothrin + Dimethoate) on major associated arthropods and performance of watermelon

Okrikata¹,

Agere²,

Adepoju³

et al. 2021

ijs

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Some crop growers hold the view that application of pesticides at higher than the manufacturer's recommended doses results in better pest control and crop productivity. The veracity of this perception was evaluated in field experiments at the experimental field of Federal University Wukari. A recommended insecticide and acaricide; ® Magicforce (Lambda-cyhalothrin 15g/L + Dimethoate 300 g/L) was evaluated against insect pests of watermelon (Citrullus lanatus Thunb.) and other associated beneficial arthropods. The experiments were laid in a Randomized Complete Block Design with five treatments (control inclusive). Data collected includes arthropod (pest and beneficial) densities, crop growth, and number of fruits at the early-fruiting stage which were analyzed using variance analysis after appropriate transformations. Student's t-test was used to compare early- and lateseason's variables while correlation and regression analyses were used to determine relationships between key variables. Results showed that plots treated with double the highest manufacturer's recommended dose of ® Magicforce (cost implication of ₦ 144,000) had lower pest (leaf beetle species and Bactrocera cucurbitae) and beneficial arthropod (predatory ants, spiders and Apis mellifera) densities than those treated with the lowest (cost – ₦ 48,000) and highest (cost – ₦ 72,000) recommended doses. Their plant growth (vine length and number of leaves) and fruit production were however comparatively lower though largely statistically comparable. The ® relationship between the quantity of Magicforce applied and number of fruits produced were though positive, 2 2 only moderate and insignificant in both early- (r = 0.665, R = 44.3%, p = 0.220) and late- (r = 0.659, R = 43.4%, p = 0.227) crops. The results revealed that the application of double the manufacturer's recommended dose of ® Magicforce (with its comparatively higher cost implication of 100 – 200%) suppressed growth of watermelon by 1.96 – 6.20%, and impeded fruit production by 9.14 – 13.30%. While there is need to verify the mechanism of this key finding, the need to source for genuine pesticides and follow manufacturer's recommended doses a re highlighted. Keywords: Arthropods, Insect pests, Organophosphate, Pesticide over-dose, Pyrethroid, Watermelon

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Influence of Some Inert Diluents of Neem Kernel Powder on Protection of Sorghum Against Pink Stalk Borer (Sesemia Calamistis, Homps) in Nigerian Sudan Savanna

Cited by 8 publications

References 5 publications

Management of <I>Sitophilus zeamais</I> Motschulsky (Coleoptera: Curculionidae) using Nigerian Raw Diatomite

Management of <I>Sitophilus zeamais</I> Motschulsky (Coleoptera: Curculionidae) using Nigerian Raw Diatomite

Evaluation of Neem Dust Formulations for the Control of Sorghum Stemborers in the Semi-Arid Zone of Nigeria

Impact of doubling the recommended dose of Magicforce (Lambda-Cyhalothrin + Dimethoate) on major associated arthropods and performance of watermelon

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