44 THE EEPOET OF THE No. 36 



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Mr. Baker: When was it applied? 



Prof. Caesar : We got the best results by applying it in the evening just 

 before the slugs come out to feed. 



Mr. Gibson: We tried this remedy in connection with beans. I would 

 recommend dusting freshly slaked lime every evening before the slugs come 

 out, and when they eat the lime it kills them. If I remember correctly, we 

 had very little trouble afterwards. 



Prof. Caesar: The slugs do not seem to be killed with Paris green, Mr. 

 Baker tried, and it killed so slowly that it was not looked upon as la satisfactory 

 method. 



Prof. Brittain : Slugs did not appear with us this year to any extent. 

 We were going to make some extensive experiments this year, but there were 

 no slugs. 



Prof. Lochhead: Has anyone ever tried poison bait with any success? 



Prof. Caesar: No success. 



Prof. Lochhead : The old English remedy of course is slaked lime. Whether 

 it is effective all the time or not I do not know. 



Prof. Caesar: Tobacco extract does not have much effect upon slugs, but 

 millipedes are usually poisoned by it. 



THE APPLE AND THORN SKELETONIZEE (HEMEROPEIIA PARI AN A 



CLEECK) . 



E. P. Felt, State Entomologist op New York. 



A small European moth which we have termed the apple and thorn skeletonizer 

 has become well established in Westchester and Eockland counties, the centre 

 of the infestation being near Irvington and Nyack, respectively. This insect is 

 classed as one of minor importance in Europe though this is not necessarily 

 to be the case in America. Some of our most destructive insects are of relatively 

 slight importance in their native country. Owing to the fact that the cater- 

 pillars feed upon the upper surface of the leaves, it is easy to apply a poison 

 'where it will do the most good. It should not be difficult to keep this pest in 

 control until its status can be determined or natural enemies have an opportunity 

 to assert themselves and prevent widespread and material damage. This insect 

 is already sufficiently numerous near the centre of the infested area to defoliate 

 entire orchards and conditions favor a continuation of the spread with its accom- 

 panying serious injury unless there is early, thorough and general spraying in 

 tjie infested area next summer. 



Eecognition Characteristics. The work of this newly established pest 

 is fairly characteristic. It skeletonizes the leaves in much the same way as the 

 well-known canker-worms, except that these latter more usually devour all the 

 vital tissues of nearly every leaf, whereas this newly introduced caterpillar 

 generally confines its attack to portions of many leaves, feeding near the centre 

 under a slight web and extending upward and outward to include most of the tip of 

 the leaf and frequently turnins: and webbint? down margins of leaves about half an 

 inch wide. Areas on each side of the basal part of the leaf are often untouched. 

 There is no webbing together and inclosing leaves in masses so characteristic of 



