Evaluation of wild species and cultivars of peanut for resistance to the Enneothrips flavens Moulton [Avaliação De Espécies Silvestres E Cultivares De Amendoim Para Resistência A Enneothrips Flavens Moulton]
Janini J.C.,São Paulo State University |
Junior A.L.B.,São Paulo State University |
Michelotto M.D.,Polo Apta Centro Norte |
Favero A.P.,Embrapa Pecuaria Sudeste
Bragantia | Year: 2010
In Brazil, various pests are reported to infest peanut crop, being the thrips Enneothrips flavens the most important. Accesses of wild peanut species, anfidiploide and peanut cultivars were evaluated in field conditions at Pindorama, São Paulo State, at the agricultural year of 2007/2008. The experiment consisted of a complete ramdomized block design with 48 treatments and five replications. The material was sown in small bags under greenhouse conditions. Plantings were carried out in October/November 2007. Starting at 30 days after planting in the field, evaluations were done at 15-day intervals, in five closed leaves of each plant. The following data were obtained: presence or absence of thrips in each leaf; symptoms of thrips damage in recently opened leaves, based on a 1-5 scale where 1 = without damage, 2 = 1 to 25% of the leaf surface with damage (grooves and deformations), 3 = 26 to 50%, 4 = 51 to 75% and 5 = 76 to 100% of damage symptoms. The accesses with the least damages and insect presence were: VS14957 (A. gregoryi), V13832 (A. stenosperma), V8979 (A. kuhlmannii), V9912 (A. kuhlmannii), V7639 (A. kuhlmannii) e VMiIrLbGv14309 (A. villosa). The most sensitive accesses were V12549 (A. hypogaea), Ac2562 (A. hypogaea) and the commercial A. hypogaea genotypes IAC Caiapó and IAC Runner 886.
Effect of the growth regulator prohexadione-ca on the cycle reduction and other traits of runner peanut [Efeito do regulador de crescimento prohexadione-ca na redução do ciclo e outras características do amendoim rasteiro]
Finoto E.L.,Polo Apta Centro Norte |
Godoy I.J.,Instituto Agronomico Of Campinas |
Carrega W.C.,Polo Apta Centro Norte |
Crosariol Netto J.,Polo Apta Centro Norte |
And 2 more authors.
Bioscience Journal | Year: 2011
To expand the peanut as a succession crop during the sugarcane crop renewal areas, it isnecessary to limit its cycle duration, mainly in runner cultivars. One of the alternatives is to reduce the cycle using growthregulators. This work was done to test, under field conditions, the effect of Prohexadione-Ca on the cultivar IAC 503, arunner cultivar whose cycle exceeds 130 days. The experiment was carried out in an experimental area in the center northregion of São Paulo State. The experimental design was a complete randomized blocks with eight treatments and fourreplications. The treatments consisted of dates of application and doses of the product. Plant vegetative characteristics,yield and percentage of pod maturity were evaluated in three harvesting dates. Moderate effects of Prohexadione-Ca wereobserved in percentage of pod maturity, branch growth and yield, as compared to the control. The treatments with two orthree applications of the regulator were, in most cases, more effective than where only one application was done. The bestdose situates between 110 and 220 g i.a.ha -1, with two applications. The effects on the maturation of the regulator weresmall in the three harvest dates showing that it is necessary to continue this work, improving the methodology and evaluatethe best treatments in another crop year.