172 ANNUAL REPORT OF THE Off. Doc. 



(4.) Provisious for orchard iuspectiou and the suppression of the 

 jSan Jos6 Scale and other pests. 



(5.) Room for the proper prosecution of this important work. 



(6.) A contingent fund in order that we may be able to meet 

 various conditions as they arise. 



(7.) An Insectary or room similar to a green-house for rearing and 

 studying living insects and their enemies. 



We have asked only for that which is needed in order to put this 

 work upon a proper footing and to give our citizens the services 

 that are greatly needed, and we earnestly hope that there will in 

 time be a means of supplying these desiderata. 



(11.) A REVIEW OF ECONOMIC ZOOLOGY IN PENNSYLVANIA FOR 

 THE YEAR : 



It is fitting that we should report upon the chief features of 

 Economic Zoology to which our attention has been called during 

 the past year. This shows the line of investigation and publication 

 that is needed in this State, and also gives a historical record for the 

 future reference of workers on these subjects. 



(1.) MOLLUSCA: 



Some complaints have reached us of the destruction by slugs 

 or shelless snails, especially in beds of young plants, such as to- 

 bacco, and in some hot-beds and green houses. These reports 

 have come mostly from the southeastern portion of the State, and 

 from regions where the soil and atmosphere were damp. Upon 

 garden crops we have found the slugs very abundant and destruc- 

 tive, especially upon peas and cabbage, as well as on other plants 

 growing close together in such a way as to form shade and keep the 

 ground damp. These pests feed during the night or upon damp 

 days, when the air is moist, and conceal themselves under rubbish 

 or in the soil or under boards during the day time, or when the air 

 is dry. If it become very dry, they go into soil for aestivation. 

 When they are to be found, they may be killed by dusting them 

 with freshly-powdered lime. One should hunt them in tobacco beds 

 and other beds of plants, remove them, and then surround the 

 beds or plants to be protected by a row of ashes, or of air-slaked 

 lime. As long as this is kept dry the slugs will not cross it. 



(2.) ARACHNIDA, OR SPIDERS AND MITES: 



There has been much complaint of red spiders or red mites, espe- 

 cially upon plants in houses or in green houses. Also, the peach- 

 leaf mite upon peaches in nurseries has caused hundreds of dollars' 

 worth of loss. Sulphur is the chief material to use against these 

 either as a dry dust (using the flowers of sulphur), or in water as a 



