Effect of Planting Dates ofCorn on the Damage Causcd hy Dilobodertis abderus (Sturrn) (Colcoptera: Melolonthidac) Larvae in No-Tillage ABSTRACT -A field experiment was carried out in Cruz Alta. RS. during the 1990/1991 growing seasori, in a Oxissol (Dark-red Latosol). under no-tiliage system, to evaluate thc cffect of planting date of corn on the clamage caused by larvae oU Diloboderus abderus Sturrn, and on thc crop population density and productivity. The experimental dcsign was of complete randomized blocks with split plots and 10 replications. The trcamcnts were the two planting dates (D1 = August 20 and D, = October 1), and the subtreatments the untreated check (NTC) and insecticijie thiodicarh (Semevin 350 RM 700 g a.i./lOO kg ofseeds (SCI). A significantly smaller number of larvae and a higher plant population and yield productivity were ohserved in SCI compared to NTC in D1 . In D, parameters ineasured were cquivalcnt hoth in NTC and SCI. The manipula: tion of the planting date. starting in October, leads to a significant reduction in the attack of larvae.
Oviposition Preference of Di!o/,oderus abderus (Siurni) on Cultural .Residucs o! Soil linder No-tiliage ABSTRACT -0v iposition prefercnee of L)ilohoderus abderus (Sturrn) females on cultural residues ei plants on the soil surface under no-tillage was evaluatei!. Significant difícrences were ohserved on the amount of cultural residues due te the plant specics tesied and on the number of nests and eggs below ihe soil surface. Significant positive correlauons were ohtained between cultural residues and number of nests and eggs. both for wintcr and sumrncr plants.Strategies to reduce larvae populations for subsequcnt winter crops inclucle erop succession. such as: rye-grass, rape. vetch or lupine with coro, wliich is nonially sown in Septernhcr and October. in substitution te hlack oat with soybean. That succession aliows a smaller amount of residues on the soil during the reproductive period cl feniale decreasing oviposition.
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