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Crvenoglavi repičin buhač jedan je od najvažnijih jesenskih štetnika uljane repice. Odrasli oblici napadaju biljke u ranim fazama rasta. Velike štete prave ličinke u jesen koje se ubušuju u peteljke listova. Istraživanje dinamike populacije, seksualnog indeksa i štetnosti crvenoglavog repičinog buhača na lokalitetu Šašinovečki Lug, provodilo se od rujna 2017. do travnja 2018. Dinamika populacije odraslih oblika pratila se pomoću četiri žute posude, a izdvajanje mužjaka od ženki crvenoglavog repičinog buhača obavljalo se prema morfološkim značajkama. Štetnost se utvrđivala disekcijom biljaka za koju su uzimani uzorci od deset biljaka s četiri mjesta u usjevu. Kroz istraživanje prikupljeno je ukupno 225 odraslih oblika i 95 ličinki crvenoglavog repičinog buhača. Prva pojava i vrh leta crvenoglavog repičinog buhača zabilježena je 5. rujna 2017. godine u fazi klijanja, a zadnji let utvrđen je 13. ožujka 2018. godine u fazi razvijenih 7 – 8 pravih listova. Prisutnost ličinki u biljkama uljane repice utvrđena je između faze razvijenih pet pravih listova i faze „žutog pupa“. Od velike je važnosti praćenje visine populacije odraslih oblika kako bi se utvrdio optimalni rok tretiranja i primijenile odgovarajuće mjere suzbijanja. The cabbage stem flea beetle is one of the most important autumn pests of oilseed rape. Adult forms attack oilseed rape in early stages of growth. Larvae make big damages on leaf petioles throughout the fall. Investigation of the population dynamic, sexual index and damages of cabbage stem flea beetles. was conducted at Šašinovečki Lug from September 2017 to April 2018. Dynamic population was monitored using four yellow water traps. The cabbage stem flea beetle males and females were separated by morphological features. Damages caused by cabbage stem flea beetle larvae were conducted by oilseed rape plants dissection and one sample consisted from ten plants on four places in the crop. In total, 225 adult forms and 95 larvae of cabbage stem flea beetle were collected. The first occurrence and the peak of flight of cabbage stem flea beetle was recorded on the 5th of September 2017 in germination stage. Last flight was recorded on March 13, 2018 in phase of 7-8 leaves unfolded. Presence of larvae in oilseed rape was established between stage of five leaves unfolded and "yellow bud" stage. It is very important to monitor pest abundance in order to determine optimal time of treatment to apply control measures. |
