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Register a new userInfluence of different host plants on growth and development of the gypsy moth larvae LymantriadisparL (Lepidoptera: Lymantriidae).
تأثير بعض العوائل النباتية المختلفة على نمو و تطور يرقات حشرة جادوب العذر Lymantria dispar L.(Lepidoptera., Lymantriidae)
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يعد جادوب العذر LymantriadisparL. من الحشرات متعددة العوائل النباتية ، مما يفترض معه تأثر تطوره و نموه بنوع الغذاء. لذلك تم دراسة تأثير عدة عوائل نباتية و هي التفاح، السنديان، المشمش، الدلب ، الصنوبر الثمري على نمو و تطور اليرقات و العذارى ضمن ظروف المختبر. ظهرت اختلافات بعدد و مدة الأعمار اليرقية تبعا لنوع الغذاء المقدم لليرقات. بلغ عدد الأعمار اليرقية ستة أعمار عند التغذية على التفاح و السنديان و المشمش و كانت مدة التطور اليرقي أقصر على التفاح (37,5±4,96) يوماً. بينما وصل إلى سبعة أعمار يرقية على أوراق الدلب و الصنوبر الثمري مع أطول مدة للتطور اليرقي على الصنوبر الثمري (77,1±5,46) يوما. بلغ معدل النمو الطولي و الوزني لليرقات في نهاية تطورها أعلى قيمة عند التغذية على التفاح و أدنى قيمة عند التغذية على الصنوبر الثمري. تأثر بقاء اليرقة على قيد الحياة بنوع العائل حيث كانت نسبة الموت أعلى على النبات الأقل تفضيلاً، أما العذارى فقد بلغت أعلى وزن لها مع أقصر مدة تطور على التفاح في حين كان وزنها أقل على الصنوبر الثمري مع أطول مدة تطور.
Gypsy moth (Lymantriadispar) is polyphagous insect .Therefore we had conducted an experiment to determine the influence of the following plant hosts(Malussp, Quercussp ,Prunus. armeniaca, Platanusprientalis, Pinusnigra) onthe growth and development of gypsy moth's larvae. The results showed that duration of larval development was the longest onPinusnigra(77,1±5,46) days and the shortest on Malussp(37,5±4,96) days,for larval growth in length and weight larvae had gained the higher length and weight on Malussp in the order (62±1,9)m.m (2136±9,62) mg. on the other hand the lower length and weight were on Pinusnigra in the order (38±2,44)m.m (545±7,91) m.g. mortality percent of larvae was least on Malussp.and highest on Pinusnigra. Finally, pupae had the best weight with shortest development duration on the Malussp, while the least weight and longest development duration were on the Pinusnigra. There were proportional indirect of larval percentage mortality on relation to plant host, it was highest on lower preference plant.
References used
BARBOSA.P.1978.Distribution of an endemic larval gypsy moth population among various tree spicies.Eviron.Ent.7:526-527
BARBOSA.P; JANE GREENBLATT.1978.Suitability , digestibility and assimilation of various host plants of the Gypsy moth LymantriadisparL.Oecologia (Berl) 43, 111-119
CAMPBELL,R.W;SLOAN,R.J.1977. Forest stand response to defoliation by the gypsy moth . Forest science Monograph 19.34pp
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Syrian Coastal region, using the "Galleria Bait Method". The mortality caused by
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fungal isolates against Galleria mellonella larvae was 100% after 3- 5 days post
treatment. The pathogenicity of these isolates was studied against 3rd instar larvae of
Spodoptera littoralis to detect the most virulent isolate. The mortality ranged from 75% to
100% for the all isolates at the 5th day post treatment. Spore suspension of the most
virulent isolate was used at concentration 106spore/ml by spraying it on the pupae of S.
littoralis. The percentage of adult emergence was 42% in the fungal treatment compared to
the control treatment.
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Researches. This research aims to determine the effect of some biological and genetic
indicators on the success of Carob seedlings in nurseries by studying three
kinds of
grafting: Auto-grafting, Homo-grafting and Hetero-grafting. Rootstock aged one year and
resulted by two chosen genetic types, namely, SnobarJablah and Alhafa were used. Scions,
they were taken either from seedlings with age of one year resulted by these two types or
from branches aged one year from the selected two types as well. Grafting was conducted
by using Whip Graft way in spring.
Auto-grafting has indicated the importance and the role of biological and genetic
factors for grafts and their impact on rates of grafting success. Concerning rates of success,
the results have shown that Auto-grafting surpassed Hetero-grafting with a significant
reference for both of two genetic types, regardless if the used scion was young or old.
In addition, Auto-grafting has shown surpass on other kinds of grafting, in terms of
subsequent growth of scions. On the other hand, a variety in biological indicators values
has been noticed between the two genetic studied types. In favour of SnobarJablahtype
againstAlhafaʼs type. However, the differences of values were not significant for the most
of conducted measures.
As for the age of scions, the results have pointed out that values of Hetero-grafting
with young scions surpassed values of Hetero-grafting with old scions in terms of the rate
of grafting success and values of biological studied indicators.
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The effect of some essential oils taken from Cinnamomum zeylanicum, Citrus
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bees Apis mellifera L. The study was carried out in the laboratories of the Faculty of
Agriculture, Damascus University from 2012 till 2013. This is in order to contribute to
preparing an integrated pest management program for American Foulbrood disease. The
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μg/ml) using agar disc diffusion in petri plates. Results showed that the essential oils used
stop the growth of P. larvae in some of their concentrations. The minimal inhibitory
concentrations which stop the growth of P. larvae of the oils of Cinnamomum zeylanicum,
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mg/g (a+b) respectively. Treatment with 500 ppm of NaCl increased significantly
chlorophyll content compared to other salt treatments.
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