83 



The pear-tree psylla, PsyUa j^yricola Forst., is doing considerable 

 injury to some pear orchards in Kent Count3% Many trees were 

 practically killed last season in the same orchards by this pest. No 

 satisfactor}' remed}" yet found. 



The plum curculio, Conotrachelus nenuplud' Hbst. , while present in 

 all parts of the State in both peach and plum orchards, is not doing 

 serious injury. [The so-called June drop in Maryland peach belts 

 was comparatively light this season.] 



The rose-chafer, 2facrodactylus subsjnnosus Fab., has been reported 

 in one or two cases as injuring grapes on the Eastern Shore. It has 

 not been abundant since the 1899 freeze. 



The San Jose scale, A-'^jjidiotus perniciosus Comst., has occupied a 

 great deal of our attention. It is still the most serious orchard pest 

 we have to contend with. Many new localities have been discovered 

 by our inspections. We have found 20 to 25 per cent kerosene and 

 water on peach just before the Inids open very effective. We do not 

 advise this strength for fall and winter on the peach. As a spring 

 spra}^ it has been very satisfactory in our mountain peach belt. After 

 the fruit is gathered we will use a 10 per cent kerosene spra}^ on infested 

 trees. [Ti^e writer saw large blocks of peach in Georgia in July that 

 had been sprayed with 10 per cent kerosene and water just after the 

 fruit was removed. The scale was in most instances killed, witli little 

 or no injury to the foliage. In all cases some leaves were injured, but 

 not enough to cause serious damage. On the other hand, however, 

 where a 10 per cent crude petroleum and water solution was used 

 the foliage was badly hurt and falling at the time of our visit, July 

 14]. As previousl}^ stated in former publications, the writer advises 

 growers to use kerosene, even in diluted form, with ever}^ caution. 

 It is a dangerous substance. 



The stalk worm of tobacco, Cramhus calig Inosellus Clem., known 

 also as the sooty corn-root webworm, has been conspicuous in 3^oung 

 tobacco, especially upon grass or sod lands. No satisfactory remedy 

 has been found as yet. Planters should avoid setting tobacco on sod 

 land. 



The striped blister beetle, EpicautamttataY2ih.^ as usual, bus l)een 

 quite a serious pest in tomato and potato fields. In one instance it 

 destroyed a field of beets. 



The striped cucumber beetle, Diabrotica vittata Fab., has been quite 

 common in cantaloupe fields. No satisfactory remedy found. 



The white-marked tussock moth, Orgyia JeuaMigma S. & A., as 

 last 3^ear, has appeared in considerable numbers upon shade trees in 

 Baltimore. 



GENERAL NOTES. 



In addition to the above, the potato-stalk weevil, Triclioharh tr'tno- 

 tata, has been quite prevalent in the State in potatoes. 



Pemphigus aceTifolU Rile\% reported by me as doing injury to 

 maples at the Agricultural College in 1898 and 1899, has been quite 



