Cotton—Aphid and Whitefly Monitoring

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Cotton—Aphid and Whitefly Monitoring Supplement to UC IPM Pest Management Guidelines: Cotton www.ipm.ucdavis.edu Take a combined sample for aphids and whitefly at least once a week. Directions: 1. Beginning at least 50 paces into the field, pick a plant at random and turn over the 5th leaf from the terminal. Examine the underside of the leaf with a hand lens. 2. Count the aphids and record the number and color. 3. Check for whitefly adults. If 3 or more are present, note the leaf as infested on the form. 4. Note the presence (+) or absence (-) of large whitefly nymphs in the area defined by a leaf disc. 5. Move 20 paces further into the field and select another plant to examine. Repeat the steps above in 4 representative areas of the field for a total of 40 plants. 6. Compute average infestation levels and compare with treatment thresholds. 7. Check field edges for whitefly migration. Grower__________________________ Field________________________ Date _______________ Aphids Whitefly Adults: (+) Plant Yellow or if 3 or Nymphs: Natural enemies number Count Black more (+ or -) (Note species) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 (rev. 17 February 2005) Print copies of this form at www.ipm.ucdavis.edu/FORMS/ Produced by the UC Statewide IPM Program Page 2 Cotton—Aphid and Whitefly Monitoring (continued) Aphids Whitefly Adults: (+) Plant Yellow or if 3 or Nymphs: Natural enemies number Count Black more (+ or -) (Note species) 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Total: Total: Total: Percent Percent Average: infested: infested: Aphids: Whitefly: First square to open boll: Adults: 40%. Do not use 50-75 aphids per leaf. IGRs if nymphs absent. If no After open boll: 10-15 nymphs, but 10 or more small yellow aphids or adults per leaf, treat field large black aphids per edges only if infestation leaf. limited to edges. Nymphs: 40% (rev. 17 February 2005) Print copies of this form at www.ipm.ucdavis.edu/FORMS/ Produced by the UC Statewide IPM Program.

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Aphis Fabae Scop.) to Field Beans ( Vicia Faba L.
ANALYSIS OF THE DAMAGE CAUSED BY THE BLACK BEAN APHID ( APHIS FABAE SCOP.) TO FIELD BEANS ( VICIA FABA L.) BY JESUS ANTONIO SALAZAR, ING. AGR. ( VENEZUELA ) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE UNIVERSITY OF LONDON OCTOBER 1976 IMPERIAL COLLEGE FIELD STATION, SILWOOD PARK, SUNNINGHILL, ASCOT, BERKSHIRE. 2 ABSTRACT The concept of the economic threshold and its importance in pest management programmes is analysed in Chapter I. The significance of plant responses or compensation in the insect-injury-yield relationship is also discussed. The amount of damage in terms of yield loss that results from aphid attack, is analysed by comparing the different components of yield in infested and uninfested plants. In the former, plants were infested at different stages of plant development. The results showed that seed weights, pod numbers and seed numbers in plants infested before the flowering period were significantly less than in plants infested during or after the period of flower setting. The growth pattern and growth analysis in infested and uninfested plants have shown that the rate of leaf production and dry matter production were also more affected when the infestations occurred at early stages of plant development. When field beans were infested during the flowering period and afterwards, the aphid feeding did not affect the rate of leaf and dry matter production. There is some evidence that the rate of leaf area production may increase following moderate aphid attack during this period. The relationship between timing of aphid migration from the wintering host and the stage of plant development are shown to be of considerable significance in determining the economic threshold for A.
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