ORIGINAL ARTICLE
Bioactivity of Azadirachtin Against Scrobipalpa ocellatella Boyd. (Lep.: Gelechidae) on Sugar Beet
somaye allahvaisi 1, A-B,D-F  
,   bahram heidari 2, B-C,E,   mahdi hassani 3, B-C,E
 
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1
Plant Protection Research Department,, Plant Protection Research Department, Hamedan Agriculture and Natural Resources Research and Education Center, AREEO, Hamedan, Iran, Iran
2
Department of Plant Production and Genetics, Department of Plant Production and Genetics School of Agriculture, 7144165186 Shiraz University, Iran
3
Sugar Beet Research Department, Sugar Beet Research Department, Hamedan Agriculture and Natural Resources Research and Education Center, AREEO, Hamedan, Iran, Iran
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
CORRESPONDING AUTHOR
somaye allahvaisi   

Plant Protection Research Department,, Plant Protection Research Department, Hamedan Agriculture and Natural Resources Research and Education Center, AREEO, Hamedan, Iran, opposite of Jowraqan city, 5km to Tehran, 6519141175, hamedan, Iran
Submission date: 2021-01-05
Acceptance date: 2021-04-23
Online publication date: 2021-06-21
 
 
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ABSTRACT
The use of environmentally friendly bio-pesticides is crucial for higher root and sugar yield in sugar beets. The economic importance of beet moth (Scrobipalpa ocellatella Boyd. (Lep.: Gelechidae)) losses in the field and storage highlight the need for evaluation of appropriate, environmentally friendly methods for pest control. The aims of the present study were to i) assess azadirachin (AZN) effects on the life cycle and activity of the pest, and ii) manage the beet moth on roots under laboratory conditions. For the experiments, the main concentrations were prepared on the basis of the field-recommended dose of this pesticide (1-1.5 Liter / 1000 Liter water). The LC50 was estimated for 3rd instar larvae. Later, at sublethal concentrations, the relative time for the emergence of each developmental stage was determined. The mean female fecundity was 37% (±4) for treated tests at the lowest AZN concentration (0.5 ml l-1). AZN at 0.5 ml l-1 concentration resulted in 62 (±4) deposited eggs per plant for the treated roots and 326 (±1) for roots in the control test. Mortality increased in response to increased AZN concentrations. The results revealed that after 72 h, the highest AZN concentration (2.5 ml l-1) caused 100% repellency and 82% (±1.38) mortality on 3rd instar larvae. According to our findings, a concentration of 2 ml l-1 AZN (20 gr active ingredient per 1 hectare) after 4 days affected 1st instar larvae and the larvae with no further development had 92.2% (±1.2) mortality. In conclusion, the results revealed that AZN as a biorational pesticide can significantly minimize the losses of S. ocellatella on sugar beet crops.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
eISSN:1899-007X
ISSN:1427-4345