Field and biochemical studies on some compounds against cotton leafworm, Spodoptera Littoralis (BOISD.) [electronic resource].
دراسات حقلية ومعملية على بعض المركبات ضد دودة ورق القطن.
- P. 1087-1106.
Includes references.
This study was conducted to evaluate the efficiency of three plant extracts i. e. NeemAzal, soybean and garlic (Biorepel) and five insect growth regulators (IGRs) i. e. Consult, Atabron, Cascade, Match and Mimic using the recommended field rate to control the cotton leafworm in cotton and Egyptian clover fields at Zagazig region, Sharkia Governorate in 1999 and 2000 seasons. Plant extracts; NeemAzal recorded the highest initial and residual reduction percentages in both seasons in cotton fields, the highest initial reduction reached 30.33% whereas the highest residual reduction was 39.88%. However, in clover fields the highest initial reduction reached 32.11% in 1999 season with Biorepel, whereas NeemAzal recorded the highest residual reduction percentage in the same season (36.03%). As for the initial and residual reduction percentages in 2000 season (25.99 and 38.63%, respectively. IGRs, The initial reduction percentages did not recorded reduction percentages 92.00% in both crops for the all tested compounds except Mimic which recorded initial reduction percentages less than 77.00% in 1999 season in cotton field, while the residual reduction did not rise than 87.00% in 2000 season. As a general trend, the IGR Atabron is consider the most effective in reducing the pest population Changes in total soluble protein, transaminase enzymes (GOT and GPT) and carbohydrate hydrolyzing enzymes (amylase, invertase and trehalase) activities in the 4th instar larvae of the cotton leafworm, Spodoptera /ittora/is (Boisd) as affected by plant extracts laboratory application were studied. Results appeared the following founding 1. All the tested compounds decreased the total soluble protein content except the lowest concentration of Biorepel after 2 days. 2.All the tested compounds exhibited high increase in GOT and GPT activities in comparison with the control at all interval times. 3. GPT activity in all tested compounds at all concentrations was higher than check samples. 4. Trehalase, invertase and amylase enzymes activities were higher than the control at all concentrations of all tested compounds.