A22-Lancaster Fanning, Saturday, July 15, 2000 Potato Leafhopper Control (Continued from Pago A2l) as a sign of damage. The nymph or immature stage is light yellow and walks sideways. According to a Penn State handout, feeding by the insects causes severe stunting of the plants and yellowing or redden ing of the foliage. Leafhopper damage starts in wedge-shaped areas at the tip of the leaf. The first cutting of alfalfa is not usually affected, but subse quent cuttings can be severely injured. The offspring produced by the female leafhoppers, es pecially the last two weeks before harvest, are “really going to cause you trouble,” noted Art Hower at the field day. Don't need a winch or accessories'' Act before July 31.2000, and you can buv an; Polaris ATV with Zero Down and payments as low as $4B/month ** 515 North Reading Road, Rt. 272, Ephrata, PA 17522 i 717-733-4151 1-800-522-3714 (PA Only) POLRRIS The Way Out. Wmih offer excludes lax <me 'reign, dealer mstaHalioo and setup See de*er tor details Retail customers only At partrcipaimg dealers only * ‘financing tor qua ified Customers cm fl»» Star Card provided by Iransimetica Bank N A Example Im-ttaaer at 1299% APR am! 15% mmrpum repayment on $3199 for two yens Mffer promo'ion balance subject lo 25% mirimum repayment and fl 5% APR Siaodaro APR may vary Available&l DO through 731D0 Does not mclud* Ux title freight and set up flaming AIVs can be hanrdwis to ointe N*ver carry passengers Be especially cartel on difhcuß terra* Never 'kJe on public reads always avo-d paved surtaxes Always wear a helmet and protective clothing Pofens ATVs may not be ndden by anyone unde' 16 and a<l riders shoiotf take a training course for safety and framing information see your Polar* dealer or cail 1 500-342 3764 © 2000 Wans Sales Inc Typically the adults migrate up from the Gulf Coast on storm fronts, according to Hower. But some can overwinter possibly even as far north as Maryland. Hall noted that leafhopper damage can result in losses to talling 500 pounds per acre per cutting, in addition to reduced protein yield. New biological control meth ods make use of glandular hairs on the alfalfa which prevent the leafhopper from feeding. Hower spoke about the mor- 1 * tality and entrapment of potato leafhopper nymphs, compari sons of leafhopper nymphs on resistant and susceptible alfalfa (with trichomes intact or re moved), and eggs laid by the leafhopper in resistant and sus ceptible alfalfa with trichomes intact and removed. Breeding for these traits is dif ficult, noted Hall. And produc ers should remember that even with 70 percent resistance, 30 percent have no resistance trait. Hower said, “Could we achieve 100 percent resistance? I don’t know if we can do that, if , fc The Agri-specialists from Farmers First aren’t a bunch of deskbound bankers waiting around for the phone to ring. We get involved with you. Right where you live and work. We lend the money farmers need to keep growing. And, we can’help your business in a lot of other ways, too. We talk the talk. And we walk the walk (wherever that might lead us). How Much is PLH Resistance Worth to You? (assuming four production years after establishment year) Will you spray for PLH if scoudng indicates it is justified or if damage is visible? Yes - continue to question #2 No - PLH resistance is worth additional costs Do you determine when to spray based on scouting or when you see yellowing? Yellowing - proceed to question #3 Scouting - proceed to question #4 How often do you see yellowing or does scouting indicate spraying is necessary? Frequency Value (Alfalfa valued @ $l2O/ton) 2 per 1 yr - 240 1 per 1 yr - 120 1 per 2 yr - - 60 1 per 3 yr - 40 lper4yr- 30 1 per 5 yr - 20 Never- 0 Based on either scouting or yellowing, how often do you spray to control PLH? 2 per 1 yr -1 per 1 yr -1 per 2 yr -1 per 3 yr -1 per 4 yr - 1 per 5 yr- Never - * value based $5/acre/year scouting charge and SlO/acre for each spraying 5. Determine value of PLH resistance. Value from question #3 Value #5 Value #5 / Seeding rate (Ib/acre) = Value ($/lb of seed) of PLH resistance trait on your farm. Out in vo we’ll ever see that.” But if the producer doesn’t want to spray, having resistant varieties are worth it, said Hower. John Ayers, Penn State crop pathology specialist, said that conditions could be just right for stalk rot on com. Stalk rot, a major stress dis ease, is caused by early season sunshine and lots of moisture. But a sudden dry spell, a slight moisture deficit, after these con ditions can set it off. The nutrients travel to the kernels and weaken the plant. (only if you answered yellowing to question #2) ANDY TERRELL RONERB JAY HERSHEY (717)626-4735 ( 717)768-7337 (717)768-8256 EXT 264 The Agri-specialists FARMERS FIRST miML A SUSQUEHANNA BANC Already Ayers has seen an thracnose stalk rot, corn rust, and northern corn leaf blight in fields. David Wagner, Penn State precision ag specialist, spoke about the importance of learn ing spray calibration. Spray drift liability is “be coming a big cost factor in your bottom line,” he said. Wagner said it could be too expensive, as a result of lawsuits and insurance coverage, to not place spray applications prop erly. Uswj 2 per 1 yr l per 1 yr - 1 pcr2yr -1 per 3 yr - 1 pcr4yr -1 pcrs yr- Never - *3* * ~T" (Turn to Poflo A 23) Mamber FDIC
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