The Present Situation With Regard to the Control of the Pink Boll Worm in Egypt
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Date.
Percentage of Green Bolls attacked by Boll Worm.
Number of Boll Worm* per 100 Plants.
1917 1918 1919 1917 1918 1919 July 12 ... 19 ...
13 13 8 12 5 5 26 ...
15 10 8 August 2 ... 9 ...
20 28 13 21 9 14 196 415 118 276 78 170 16 ...
33 28 11 527 428 132 23 ...
49 38 17 910 597 190 30 ...
September 6 13 ...
Average ...
65 78 84 42 56 48* 31 67 88 1, 565 2, 412 2, 444 685 958 473* 400 1, 418 2, 797 40 26 1, 210 741 The decrease in the severity of the attack shown by these figures is really ve...ry remarkable, considering that direct control measures * These figures are too low owing to the fact that practically nil the samples received during this, the last, week came from the Northern Delta where the attack is always lighter. The other samples were fairly representative of the whole Delta. Accordingly no averages have been calculated for 1918 as they would not be comparable with the other yean.
10 have also diminished considerably during 'the period under review. Apart from the boll worm campaigns there are several factors which may have affected the relative abundance of the pink boll worm, namely, parasites, the weather, and changes in agricultural practice.
What to read after The Present Situation With Regard to the Control of the Pink Boll Worm in Egypt?
You can find similar books in the "Read Also" column, or choose other free books by G Storey to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Date.
Percentage of Green Bolls attacked by Boll Worm.
Number of Boll Worm* per 100 Plants.
1917 1918 1919 1917 1918 1919 July 12 ... 19 ...
13 13 8 12 5 5 26 ...
15 10 8 August 2 ... 9 ...
20 28 13 21 9 14 196 415 118 276 78 170 16 ...
33 28 11 527 428 132 23 ...
49 38 17 910 597 190 30 ...
September 6 13 ...
Average ...
65 78 84 42 56 48* 31 67 88 1, 565 2, 412 2, 444 685 958 473* 400 1, 418 2, 797 40 26 1, 210 741 The decrease in the severity of the attack shown by these figures is really ve...ry remarkable, considering that direct control measures * These figures are too low owing to the fact that practically nil the samples received during this, the last, week came from the Northern Delta where the attack is always lighter. The other samples were fairly representative of the whole Delta. Accordingly no averages have been calculated for 1918 as they would not be comparable with the other yean.
10 have also diminished considerably during 'the period under review. Apart from the boll worm campaigns there are several factors which may have affected the relative abundance of the pink boll worm, namely, parasites, the weather, and changes in agricultural practice.
What to read after The Present Situation With Regard to the Control of the Pink Boll Worm in Egypt?
You can find similar books in the "Read Also" column, or choose other free books by G Storey to read onlineMoreLess
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