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首页> 外文期刊>Crop Protection >Rice harvest cutting height and ratoon crop effects on late season and overwintering stem borer (Lepidoptera: Crambidae) infestations.
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Rice harvest cutting height and ratoon crop effects on late season and overwintering stem borer (Lepidoptera: Crambidae) infestations.

机译：水稻收割期的减产和再生稻作物对晚季和越冬茎bore（鳞翅目：Crombidae）的侵害。

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A 2-year field study in Texas compared infestations of the stem borers Eoreuma loftini (Dyar) and Diatraea saccharalis (F.) in rice, Oryza sativa L., as affected by main crop harvest cutting height and the production of a ratoon crop. Substantial infestations (>5.6 stem borers/m2) remained in rice culms regardless of cutting height (20 vs. 40 cm). However, the 20-cm cutting height reduced E. loftini infestations by 70-81% whereas D. saccharalis infestations were not affected. Plant dissections showed that compared to D. saccharalis larvae and pupae, relatively more E. loftini immatures are located high in rice plants (>20 cm from the base of the culm). In October, the ratoon crop was more infested with stem borers than the unmanaged main crop stubble during the first year of the study. The opposite was observed during the second year. Differences in unmanaged main crop stubble phenology between the two years likely caused these differences in infestation levels. During the post-growing season, infestations in main and ratoon crop stubble decreased over the winter. After favorable winter conditions, infestations in main and ratoon crop stubble did not differ, attaining 3.3 E. loftini/m2 and 0.4 D. saccharalis/m2 by March 2008. In March 2009, rice stubble harbored 0.3 E. loftini/m2 and 0.2 D. saccharalis/m2 regardless of whether only a main crop or a main and ratoon crop had been produced. This study showed that a lower rice harvest cutting height can suppress late season E. loftini populations. Furthermore, rice stubble under favorable conditions represents a substantial overwintering habitat, thus warranting evaluation of pest management tactics targeting overwintering populations.Digital Object Identifier http://dx.doi.org/10.1016/j.cropro.2011.11.019
机译：在德克萨斯州进行的一项为期2年的田间研究比较了水稻（i.Oryza sativa）中茎bore（Eyuma loftini （Dyar）和 Diatraea saccharalis （F.）的侵染性i> L.，受主要农作物收割高度和再生作物产量的影响。不论割伐高度（20厘米对40厘米）如何，稻秆中仍存在大量虫害（> 5.6茎虫/ m 2 ）。但是，20厘米的切割高度降低了E。 loftini 的侵扰率为70-81％，而 D。蔗糖侵染未受影响。植物解剖显示与D相比。蔗糖的幼虫和p，相对较多。 loftini 未成熟植物位于水稻植物中的高度较高（距茎秆底部20厘米）。在研究的第一年，与不受管理的主要农作物茬相比，十月份的再生农作物受到茎bore虫的侵害更多。在第二年观察到相反的情况。两年间未受管理的主要作物发茬物候的差异可能导致了这些侵扰水平的差异。在生长后的季节，冬季主季和再生作物茬的侵害有所减少。在有利的冬季条件下，主茬和再生作物茬的侵染没有变化，达到3.3E。 loftini / m 2 和0.4 D。 saccharalis / m 2 到2008年3月。2009年3月，稻茬残留了0.3 E。 loftini / m 2 和0.2 D。 saccharalis / m 2 不论仅生产主要作物还是主要和再生作物。这项研究表明，较低的水稻收割高度可以抑制晚季E。 loftini 人口。此外，在有利条件下的稻茬代表了大量的越冬栖息地，因此值得针对越冬种群进行有害生物管理策略评估。数字对象标识符http://dx.doi.org/10.1016/j.cropro.2011.11.019

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