马尾松种实病虫害防治研究

湖南马尾松种实害虫有七种,松梢小巷蛾和微红班螟是主要害虫。主要危害二年生球果,被害率高达46.49-47.76％。害虫天敌有三种。种实病害主要表现在一年生幼果大量脱落,落果率达33.35-36.12％。发病原因经室内病原茵诱发试验和分离培养,尚未获得致病茵,初步诊断为一种生理病害。病虫发生高峰期均在4-6月份,此时为防治关健时期。氧化乐果等防治马尾松种实害虫效果可达70％以上。无性乐间搞虫性略有差异。九二0生长激素和钼酸钠微肥防治生理落果有较明显防治效果。

A STUDY OF CONTROL OF SEED CONE DISEASE AND INSECTS OF MASSONIANA PINE

There are seven species insects of Massoniana pine seed have been found in Hunan province with the main harmful speice being Rhyacionia dative.H. and Dioryceia Rubella.H. They harm mainly' the 2-year-age cones with their rate being 46.49-41.16% .and their natural enemies have 3 species.The main manifestation of seed cone disease is plenty of fall off a f. l -year- aged cones with the falling rale 33. 35 - 36. 12%. The cause is diagnosed a kind of physiological cone-fall after laboratory industion lest by pathogeny fungus saperatike cultvalion.no pathogen is found.The peak period of disease & insects happens from April to June.It' s just the time of contro11ing. One thoate is recommended to be ideal farm chemecal for control. with the effeetion of 70%or above, Stitht differences of ami -insects is enisl between clones. The' 920'growth homone and sodium mo1ybdenun trace element fertilizer can effectively and obviousty control the physiological cone-fall.