نتایج جستجو برای: heterodera

تعداد نتایج: 1088  

Journal: :Nematological Research (Japanese Journal of Nematology) 1994

Journal: :Journal of nematology 1976
A E Steele

The rate of hatching of Heterodera schachtii larvae was greatly increased by placing cysts in sieves enclosed by small disposable cups. An apparatus that permitted rapid storage of second-stage larvae at 10 C prolonged the viability of the larvae.

Journal: :Journal of nematology 1988
R D Riggs D P Schmitt G R Noel

Tests of Heterodera glycines on differential host plants to determine races were run in Arkansas, Illinois, and North Carolina to check the uniformity of results of the test. Methods used at the three locations varied somewhat. Results indicate that the race test is highly variable. Isolates previously identified as race 1 were identified as race 1 or race 3; those identified as race 2 were ide...

2001
Brian Kerry

Three species of fungi, Catenaria auxiliarls (Kiihn) Tribe, Nematophthora gynophila Kerry and Crump, and a Lagenidiaceous fungus have been found attacking female cyst nematodes. All are zoosporic fungi which parasitize females on the root surface, cause the breakdown of the nematode cuticle, and prevent cyst formation. Their identification and some aspects of their biology are reviewed. N. gyno...

Journal: :Journal of nematology 1973
A E Steele

Cysts of Heterodera schachtii were treated in a water bath at constant temperatures ranging from 45 - 62.5 C for 1 sec to 28 hr. Treated and untreated cysts were incubated 8 weeks in sugarbeet root diffusate at 24 C to measure emergence of surviving larvae. Within the temperature range of 49 - 54 C, the minimum lethal temperature was proportional to the log time of treatment. No larvae emerged ...

Journal: :Integrated Pest Management Reviews 1995

ژورنال: :plant protection journal 0
ali reza ahmadi zahra tanha maafi tofigh abeyat

نماتدهای سیستی غلات از مهم ترین نماتدهای خاکزی خسارت زای گندم و جو در جهان می باشند. گونه heterodera filipjevi به طور وسیعی در مزارع گندم کشور گسترش دارد. در این مطالعه تأثیر گونه فوق بر روی تعدادی از ارقام متداول غلات در خوزستان، آزمایشی با چهار رقم گندم (چمران، ویریناک، یاواروس و بهرنگ)، یک رقم جو (زهک) و یک رقم تریتیکاله (ژانیلو) در قالب طرح بلوک های کامل تصادفی با 6 تیمار (شامل یک قطعه سمپا...

Journal: :Journal of nematology 1993
S Hashmi L R Krusberg S Sardanelli

Reproduction of the corn cyst nematode (Heterodera zeae) and its effect on growth of corn (Zea mays) was studied in plant growth chambers at 24, 27, 30, 33, and 36 C. Reproduction of H. zeae increased directly with increase in temperature from 24 to 36 C. Fifteen-cm-d pots of corn seedlings inoculated with a mixture of 5,000 eggs + J2 and maintained for 8 weeks in growth chambers contained an a...

Journal: :International journal of systematic and evolutionary microbiology 2000
N Atibalentja G R Noel L L Domier

A 1341 bp sequence of the 16S rDNA of an undescribed species of Pasteuria that parasitizes the soybean cyst nematode, Heterodera glycines, was determined and then compared with a homologous sequence of Pasteuria ramosa, a parasite of cladoceran water fleas of the family Daphnidae. The two Pasteuria sequences, which diverged from each other by a dissimilarity index of 7%, also were compared with...

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