NEW APPROACHES FOR THE CONTROL OF SOME LEPIDOPTEROUS INSECT PESTS ATTACKING TOMATOES
KHALED HASSAN MOHAMED MOHAMED ABDEL- REHIM;
Abstract
Experiments were conducted at the Agricultural Experimental farm of Sabahia Station, Alexandria, Egypt. Seedlings of two tomato varieties (Castle rock and Super strain -B) were transplanted. In this study, different compounds belonging to different groups were evaluated for controlling the following main pests: the cotton leaf worm, S.littorallis and the semilooper, Ch.chalcites that attack tomato plants. The evaluated compounds were Profenofos (Selecron®
72% EC), Emamectin Benzoate (Proclaim® 5% SG) and Spinosad (Tracer® 24% SC) .three natural products as azadirachtin (Achook®), B.t subsp. kurstaki (Diple 2and Soybean oil (Natrilo® ) were also evaluated. The performance of the insecticides was evaluated individually during the successive growing seasons of 2005, 2006 and 2007. The side effect of the tested insecticides was studied upon the parasitoid, A. ruficrus. The reduction percentages of the target insect pests and/ or parasitoid induced by• the insecticidal treatments were calculated. ,
Both the insecticides of Selecron® and Proclaim® proved to the most efficient
insecticides in managing the insect pests. They have been used separately to appraise loss only in the late summer tomato crops during 2007 and 2008 seasons, at different date's post transplanting seedlings to create the "so-called" varied levels of insects' infestations, so that relationships between yield and percentages of plant infestations could be based.
In both successive late summer seasons of this investigation, tomato yield (metric ton/fed.), monetary return/fed., insecticide costs/fed., labor wages/fed., additional return over untreated control and profit for one Egyptian pound investment (L.E) were taken into account to determine the maximum profitable treatment.
5.1. Population dynamics of tomato insect pests
The population fluctuations of the assigned insect pests were studied in the late summer cultivations of 2005 and 2006 in the untreated check plots. Population dynamics were also studied in the summer cultivations of 2006 and 2007.
5.1.1. Late summer cultivation (season 2005)
It was found that the cotton leaf worm, S. littorallis was detected along the month of
May. The highest level of this insect was recorded in the first week of September (112larvae I
15 plants).Statistical analysis showed a positive correlation between the prevailing temperature and the number of the insect individuals (l = 0.6682), and the correlation coefficient was also positive with the relative humidity (R.H.) (r = 0.7551).
72% EC), Emamectin Benzoate (Proclaim® 5% SG) and Spinosad (Tracer® 24% SC) .three natural products as azadirachtin (Achook®), B.t subsp. kurstaki (Diple 2and Soybean oil (Natrilo® ) were also evaluated. The performance of the insecticides was evaluated individually during the successive growing seasons of 2005, 2006 and 2007. The side effect of the tested insecticides was studied upon the parasitoid, A. ruficrus. The reduction percentages of the target insect pests and/ or parasitoid induced by• the insecticidal treatments were calculated. ,
Both the insecticides of Selecron® and Proclaim® proved to the most efficient
insecticides in managing the insect pests. They have been used separately to appraise loss only in the late summer tomato crops during 2007 and 2008 seasons, at different date's post transplanting seedlings to create the "so-called" varied levels of insects' infestations, so that relationships between yield and percentages of plant infestations could be based.
In both successive late summer seasons of this investigation, tomato yield (metric ton/fed.), monetary return/fed., insecticide costs/fed., labor wages/fed., additional return over untreated control and profit for one Egyptian pound investment (L.E) were taken into account to determine the maximum profitable treatment.
5.1. Population dynamics of tomato insect pests
The population fluctuations of the assigned insect pests were studied in the late summer cultivations of 2005 and 2006 in the untreated check plots. Population dynamics were also studied in the summer cultivations of 2006 and 2007.
5.1.1. Late summer cultivation (season 2005)
It was found that the cotton leaf worm, S. littorallis was detected along the month of
May. The highest level of this insect was recorded in the first week of September (112larvae I
15 plants).Statistical analysis showed a positive correlation between the prevailing temperature and the number of the insect individuals (l = 0.6682), and the correlation coefficient was also positive with the relative humidity (R.H.) (r = 0.7551).
Other data
| Title | NEW APPROACHES FOR THE CONTROL OF SOME LEPIDOPTEROUS INSECT PESTS ATTACKING TOMATOES | Other Titles | الاتجاهات الحديثة لمكافحة بعض حشرات حرشفية الأجنحة التى تهاجم الطماطم | Authors | KHALED HASSAN MOHAMED MOHAMED ABDEL- REHIM | Issue Date | 2010 |
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