DELAWARE. 115 



composition of the corn kernel upon the vigor of the phmt was 

 taken up. 



Under the Hatch fund the phmt pathologist tested seeds, studied 

 a Botrytis disease of roses, and began work on a bud study of peaches 

 affected with yellows. The efforts of the horticulturist included 

 numerous variety tests of orchard fruits and vegetables, fertilizer and 

 rotation experiments with potatoes and tomatoes, and tests of fer- 

 tilizers and cover crops in orchards. 



In agronomy the work included variety tests of corn, wheat, oats, 

 cowpeas, soy beans, and other crops, and fertilizer studies with com- 

 mercial lime and stable manure in connection with four-year rotation 

 experiments with corn, wheat, oats, and grass. The value of different 

 forms of lime and phosphorus for crops and the stooling habits of 

 about GO varieties of wheat were also studied. Decided differences 

 were found to exist among varieties of wheat in their response to fer- 

 tilization and in the quantity of phosphoric acid, potash, and lime 

 taken up. It was further observed that some difference is apparent in 

 the effect of the various forms of lime on the decomposition of organic 

 matter in the soil. 



Further data in the continued study of crimson clover, with refer- 

 ence to its rate of gaining nitrogen, show that the crop may gain 

 nitrogen rapidly during the last month preceding its bloom, in some 

 cases, while in others it gains little. Crops yielding much nitrogen a 

 month before full bloom Avere found, as a rule, to gain fewer pounds 

 during the last month than crops poorer in nitrogen at this stage. 

 Approximately each additional pound of nitrogen at the earlier 

 period reduces the later gain by about one-half pound. It is stated 

 that a fall growth of crimson clover may furnish 50 to 100 pounds 

 of nitrogen per acre and be profitable even though the crop is winter- 

 killed, and that the first month's growth in spring usually produces 

 about one-third of the final yield of nitrogen. It was determined 

 that when the crop was removed 35 to 40 per cent of the nitrogen is 

 left in stubble and roots. 



The entomologist studied the life history of the apple-leaf miner 

 and the blackberry-leaf miner and gave some attention to methods of 

 their control. The most efficient method for the control of the apple- 

 leaf miner consisted in the destruction of the larvae or pupse while 

 in the leaves on the ground by burning or smothering. This insect is 

 now generally controlled in infested orchards by plowing under all 

 infested leaves in the fall or early in the spring before the moths 

 emerge. Gathering and destroying the infested leaves, especially 

 those of the first brood of the blackberry-leaf miner, is considered the 

 most feasible method of combating the pest. 



In work on the curculio it was found that three sprayings of arse- 

 nate of lead were equally as valuable as the same number of sprayings 



