DIVERSITY OF INSECT PESTS FROM COLZA CROPS IN WESTERN ROMANIA PUBLISHEDIoana Grozea, Georgeta Pop, Alin Cărăbeţ, Snejana Damianov, Otilia Cotuna, Silvia Mureşan
In the last time the colza crops is attack by numerous insect coleopterans: (Meligethes aeneus – blossom beetle, Ceutourhychus napi Gyll. – rape stem weevil), hymenopterans (Athalia rosae – colossed sawfly) and heteropteres (Euryderma ornata L – red cabbage bug). The damages caused by these various between 25 and 50%. The failing information at national and local level can be another raison for importance of colza cropping. The success of this crop through quantitative and qualitative yields depends of theoretically and practical knowledge in plant protection field. The observations were made in Experimental Field from BUASCVMT, during 2005 and 2006 years. The studied breeds were following: Ontario, Savannah, Belini, Potomac, Ader, Culvert, Tennessee, Milena, Attila and L.G (for 2005) and supplementary: Remy, Rodeo, Triangle, Ader, Alure (for 2006). It were organized varieties with different sowing densities especially of Alaska breed (8-9 IX-d 1 12.5 cm, d 2 25 cm, d 3 37.5 cm; 21 IX-d 1 12.5 cm, d 2 25 cm, d 3 37.5 cm and 2X-d 1 12.5 cm, d 2 25 cm, d 3 37.5 cm). For Attila breed were studied the presence of insects in different sowing time (I – 1- 10 IX; II – 10 – 20 IX and III – 20 – 30 IX). A great variability was observed at Milena, Ontario and L.G (Eurydema ornata, Psylliodes crysocephala, Calocoris norvegicus, Meligethes aeneus, Athalia rosae, Ceuthorrynchus quadridens, and Epicometis hirta). The breeds L.G and Potomac were the most affected by the pests, while Ader, Culvert, and Tennessee were more repellent to them. The presence of insect pests in great number in varieties LG and Savannah caused significantly yield diminution 000 (-277; -1755).
insect pests; diversity; colza crop; varieties