Research Article

Field Evaluation and Economic Assessment of Different Insecticides against Cotton Jassid, Amrasca devastans Dist.

Faisal Hafeez, Asad Aslam*, Ayesha Iftikhar, Afifa Naeem, Muhammad Faheem Akhtar and Muhammad Jawad Saleem

Entomological Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan

Received | February 14, 2020; Accepted | April 10, 2020; Published | May 15, 2020

*Correspondence | Asad Aslam, Entomological Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan; Email: mr.awan2233@gmail.com

Citation | Hafeez, F., Aslam, A., Iftikhar, A., Naeem, A., Akhtar, M.F.,Saleem, M.J. 2020. Field evaluation and economic assessment of different insecticides against cotton jassid, Amrasca devastans Dist. Journal of Innovative Sciences, 6(1): 24-29.

DOI | http://dx.doi.org/10.17582/journal.jis/2020/6.1.24.29

Keywords | Cotton jassid, IGR’s, New chemistry insecticides, BCR

1. Introduction

Cotton, Gossypium hirsutum L., is backbone of economy of Pakistan. It plays an important role in foreign exchange soenhance the country’s economy. The production of cotton crop is 1% in GDP while accounts for 5.2% in agriculture value addition (Anonymous, 2017) and overall production of cotton crop was 8.2 million 480-pound bales from the area of 2.8m ha (Anonymous, 2018).

The attack of sucking insects pests like jassid, A. devastans (Dist.), whitefly, Bemisia tabaci (Genn.) and thrips, Thrips tabaci(Lind.) on cotton (Gouda et al., 2014) has been increased due to the growing of BT cotton on extensive areas (Ahsan and Altaf, 2009; Abdullah, 2010) which is specific to chewing insect pests (Arshad et al., 2009) because these varieties are not resistance to sucking insect pests (Sharma and Pampapathy, 2006). Among sucking pests, the jassid, A. devastans, is one of the major and serious pests of cotton. Both adults and nymphs, not only suck the cell sap but also injects toxin, from underside of the leaves. Attacked leaves (first) turn pale and then rust red. The leaves then, turn downward and fall on the ground with increased passage of time. This extended action causes loss of plant vitality, boll drop and reduces yield from 18.75 % to 35 % (Ali, 1992).

There are many methods to manage the jassids like mechanical control, biological control, cultural control etc (Chinniah and Ali, 2000) but Development of resistant varieties is the best and cheapest option to manage the jassid infestation. The most vital character to make a jassid resistant variety was leaf hairiness (Krishnananda and Agarwal, 1979; Ahmad et al., 2004). But still this strategy is in the future. The one and only approach, left is the use of chemicals but should onlybe used as last way out (Korejo et al., 2000). Conventional chemicals are non selective and broad spectrum. Repeated use of these chemicals created detoxification in jassid population (Ahmad et al., 1999). The neonictiniods and growth regulators reinstated the previously used pesticides which were proved inefficient (Aheer et al., 2000; Solangi and Lohar, 2007; Aslam et al., 2004; Frank, 2012) due to resistance problems. The use of neonictiniods are supposed to be less toxic to the non-target insects like predators and parasites than other conventional insecticides (Balakrishnan et al., 2009; Sabry and El-Sayed, 2016). These chemicals are selective and specific, with no side as well as after effects on non target insects and environment (Michaud and Grant, 2003; Sahito et al., 2016).

The present study was therefore conducted to evaluate the efficacy of five presently available insecticides under the field conditions to know that either these insecticides can reduce the population of jassids below economic threshold level (ETL).

2. Materials and Methods

2.1 Study area

The study was conducted at Bahawalpur during Kharif 2018-19. The variety (FH-118) was sown (09-03-2018 and 5-02-2019, respectively). The five treatments viz. Thiacloprid 48SC (Talent), Nitenpyram 10SL (Pyramid), Thiamethoxam 25WP (Actara), Acephate 75SP (Coredor) and Chlorfenpyr 360SL (Pyrate), were applied to crops at standard doses in the month of August, when the jassid population reached at ETL.

2.2 Research design

The variety (FH-118) was selected and sown on 09-03-2018 and 25-02-2019 under randomized complete block design with five treatments and a control. The net plot size was 4.5 × 18.5 m2 and 9.15 × 13.72 m2, in 2018 and 2019, respectively. All recommended agronomic strategies was adopted on all treatments.

2.3 Data collection

The insecticides were applied on the selected plots by knapsack sprayer with hollow cone nozzle having the pressure of 3 bars. The data was recorded by randomly selecting 20 plants, in each plot. The number of A. devastans was counted, from upper leaf of 1st plant, middle leaf of 2nd plant, lower leaf of 3rd plant and then repeats the same sequence. Pre-Treatment data was observed before application of treatments. The population (post treatment) was recorded one day, three days and seven days, after application.

2.4 Data analysis

The data was analyzed with computer based software Statistix 8.1, by analysis of variance and means were separated by LSD test at 5% level of significance. Percent population change/reduction was corrected by using modified Abbotts formula (Flemings and Ratnakaran, 1985). The %age reduction in population was calculated by using following formula:

Percentage population reduction = A-B/A×100

A: Pretreatment population; B: Post treatment population.

3. Results and Discussion

Population level of jassid; before and after spray (during 2018 study period) was presented in Table 1. The Pre-treatment data comprised of 2.34-2.57 jassid/leaf (both adult and nymph), which is beyond ETL and spray was recommended. The population per leaf and percent mortality was recorded 1, 3 and 7 days after spray. Maximum decrease in mean per leaf population of jassid, one day after spray was recorded in plots treated with Nitenpyram, Chlorfenpyr, Thiacloprid and Thiamethoxam which was statistically non-significant and higher than that in plot treated with Acephate.

Three days after spray, maximum reduction in jassid population was recorded in plots treated with Nitenpyram followed by Chlorfenpyr and Thaicloprid, that were statistically similar with each other but different from plots treated with Thiamethoxam and Acephate from where minimum decrease in population were recorded. The same trend was recorded seven days after spray.

Population level of jassid during the next growing season i.e. 2019, was presented in Table 2. The Pre-treatment population of jassid/leaf was 2.08-2.38 (both adult and nymph) and spray was done. After the spray, the population per leaf and percent mortality was

Table 1: Post-Treatment/Percent population change (increase or decrease) and mean per leaf population of A. devastans (inparenthesis) on different days (before and after spray) in 2018*

Table 2: Post-Treatment / Percent population change (increase or decrease) and mean per leaf population of A. devastans (inparenthesis) on different days (before and after spray) in 2019*.

Table 3: Cumulative economic analysis of different insecticides against A. devastans of both years.

The results showed that all treatments/insecticides performed better over control. However, nitenpyram found excellent in reducing the population level (both years) of jassid. Our findings are in consonance with Bambhaniya et al., 2018; Khan et al., 2016; Qaiser et al., 2011, who reported that new chemistry insecticides are selective and specific (insect species and insect stage). These groups of insecticides are effective and more toxic to the jassid. In addition to this, Razaq et al. (2005) evaluated neonicotinoids / insect growth regulators (IGR’s) against cotton jassid and reported similar findings. However, Eittipibool et al. (2001) found differentiating records that IGR’s are the best alternative in contrast to conventional insecticides but their contribution is limited/no, in the population of reduction of jassid because the tested IGR’s do not increase hair density/length.

3.1 Economic analysis of yield

Nitenpyram treated plots recorded highest yield (3578.5 kg/ha) followed by Chlorfenpyr (3560 kg/ha), Thiacloprid (3536.5 kg/ha), Thiamethoxam (3478.7 kg/ha), Acephate (3450 kg/ha) and control (3386.5 kg/ha). The plots treated with Nitenpyram gave significantly higher yield over all other treatments. However, all the treatments showed statistically significant difference among each other. The benefit cost ratio (BCR) was maximum in nitenpyram (1.384) followed by Chlorfenpyr (1.376) and Thiacloprid (1.364), while acephate registered lowest BCR of 1.278 (Table 3). These findings are partially in consonance with Rawale et al. (2002), who reported 11.51 quintal/ha yield of seed cotton when plots are treated with profenophos + cypermethrin. However, in 2018, Rudramuni and his co-workers performed his research work in India and found that all insecticides have differentiating results but have significant superiority over control. Moreover, treated plots yielded 2–10 times more seed cotton than control. In Indian Punjab, cost benefit ratio was estimated on the basis of integrated pest management (IPM) and insect resistance management (IRM) and they (Singh and Singh, 2007) found that the cost benefit ratio is almost doubled with the adoption of with two tools.

These findings are partially in consonance with Rawale et al. (2002), who reported 11.51 quintal/ha yield of seed cotton when plots are treated with profenophos + cypermethrin. However, in 2018, Rudramuni and his co-workers performed his research work in India and found that all insecticides have differentiating results but have significant superiority over control. Moreover, treated plots yielded 2–10 times more seed cotton than control. In Indian Punjab, cost benefit ratio was estimated on the basis of integrated pest management (IPM) and insect resistance management (IRM) and they (Singh and Singh, 2007) found that the cost benefit ratio is almost doubled with the adoption of with two tools.

Conclusions and Recommendations

From above findings the studies concluded that Nitenpyram was found most effective to control the cotton jassid population below ETL followed by Chlorfenpy while accephate showed least control the pest population. The chemicals had controlled the pests as result it increased the production of cotton significantly. The above used IGRs were found insect specific chemicals and did not harm predator or parasite. So these insecticides can be used as replacement of large spectrum conventional insecticides which are resistant by pests.

Authors Contribution

Faisal Hafeez: Research planing and collection of data

Asad Aslam: Corresponding Author and help in paper writing.

Ayesha Iftikhar: Statistical analysis of data.

Afifa Naeem: Proof Reading of the research paper.

Muhammad Faheem Akhtar: Collection of data and help in data analysis.

Muhammad Jawad Saleem: Proof Reading of research article.

Conflict of Interest

The authors have declared no conflict of interest.

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