دراسة تقيم ضرر يرقات دودة ورق القطن Spodoptera littoralis (Boisd.)‎ في نباتات زهرة النيل Eichhornia crassipes (Mart)‎ Solms-Laubach المكافح بمبيدا الكلايفوسيت و 2.4-D

Abstract EN

The experiment was conducted during the growing season 2011 at College of Agriculture and forestry, Mousil University (Iraq).The aim of evaluation effect damage of Spodoptera littoralis on ichhornia crassipes (Mart) Solms-Laubach with control Glyphosate and 2.4-D herbicide were used in four concentration included (Recommended concentration from manufactured companies : 450 g i.

a.

of the first insecticide and 350 g i.a for the second, using knapsack sprayer after provided amount 100 l/Dounem) and the concentration 1:5, 1:10, 1:15 L (herbicides : water) size: size, using wiping method.It was factorial experiment in randomized complete block design (RCBD)in three replication.Data recorded form one square meter of each experimental unit after four times : 25,35,45 and 55 day after chemical control.

The results showed that the insect larvae preferred the leaves of the plants in treatment that treated with the a low concentration of the above two herbicide 1:15 Litter (insecticide: water) especially Glyphosate, that led to increase the percentage of percentage of injuries by leaf cotton larvae, and the percentage of infested leaves and gave a low dry weight after 15,25,35,45.and 55 day after treatments with an average of 75.667 % , 90 % and 17.667 g / m2 , respectively compared with the other treatments.