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RY NU NH(Bi vit tham kho t Bo co trong Hi ngh tng kt cng tc BVTV
2009 cc tnh Min Trung v
Ty Nguyn t chc ngy 3/12/2009 ti TP Pleyku Gia Lai)
1. K CH RY NU NH
La, Yn mch, Bp (ng), La m, Ma...
Ry nu nh: Small Brown Planthopper (Laodelphax striatellus
Falln)
2. PHN B
* Chu u: o, B, Sec, an Mch, Phn Lan, Php, c, Hungari, Ireland, ,
H Lan...
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* Chu : Trung Quc, Hn Quc, Nht, Vit Nam
* Vit Nam: Ry nu nh pht hin cui thng 4 u thng 5/2009 trn ging Np
TK 90 v
Bc u s 7 giai on tr bng
- Phn b ti Tnh Hng Yn, Hi Dng, Thi Bnh v Bc Ninh- Tng din tch
nhim trn 35 ha. Mt ph bin 1.000-1.500 con/m2, cao 4.000-6.000
con/m2, c bit 18.000 20.000 con/m2, gy lp lng cao trn mt s din
tch. Trong b nng l
ging la Np TK 90
3. C IM SINH HC CA RY NU NH
* Thnh trng:
- Nh ry nu, ry lng trng nhng nh hn, thch vo n
- u mu vng nht.
- t lng con c ni vi cnh c mu en
- t ngc con ci c mu vng nht gia, mu en dc theo ra sau.
- C nhng chm en gia cnh ni cui thn
- Thnh trng c 2 dng cnh
- Con ci 50-200 trng, sng 3 tun.
- Thnh trng b hp dn bi nh sng n
* Trng:
- Mu trng- thnh hng trn gn chnh ca l hoc b l gn gc la.
- Mi trng c m chp ln trn nh.
* u trng:
- Chch ht nha gc la
- Mu nu nht n nu m.
- Vo ma ng u trng T4 nm tim sinh trn cy k ch trung gian nh la,
la m, i
mch, ma, bp...
4. TC HI
- Ry nu nh chch ht lm cho bng la c ht bin mu sm, ht lp lng
nhiu
- L cn trng mi gii truyn bnh virus ln sc en RSV (Rice stripe
virus disease)
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Tc hi ca bnh RSV
Ry nu nh ti Vit Nam - Ry nu nh H Ni
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5. CCH TRUYN BNH: TRUYN BNH LIN TC V QUA TRNG
- Ly mm bnh: gn 15 pht
- bnh: 710 ngy
- Truyn bnh: hn 15 pht
- Sau khi ly mm bnh, virus nhn mt s trong c th ry, truyn bnh sut
cuc i v truyn
qua trng
- th h u tin, thnh trng truyn bnh cho rung la. Th h th 2, th 3 s
pht tn mm
bnh khp cnh ng
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6. CC C IM KHC BITa. Kch thc
Laodelphax striatellus(Ry nu nh) Nilaparvata lugens(Ry nu)
Con c:
di 1.8-2.4mm
Con ci:
+ Cnh di: 3- 4.75 mm+ Cnh ngn: 2.4- 3 mm
Con c:
+ Cnh di: 3.7- 4.2 mm
+ Cnh ngn: 2.5-2.8 mm
Con ci:
+ Cnh di: 4.4- 4.6 mm+ Cnh ngn: 2.8-3.4 mm
b. Mu sc lng v mt
Nilaparvata lugens Laodelphax striatellus
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Nu lt
u t
Mt xa
Nu m, nu en
u nhn
Mt gn
c. Dng cnh
Laodelphax striatellus
Nu nht
Nilaparvata lugens
Nu sm
d. Vt en trn cnh
Laodelphax striatellus Nilaparvata lugens
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C vin r C vin khng r
e. Chn
Laodelphax striatellus
Nu lt
Nh hn
Nilaparvata lugens
Nu m
Ln hn
f. Ca Chn
Laodelphax striatellus Nilaparvata lugens
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g. Mt trc ca u
Laodelphax striatellus (tri) Nilaparvata lugens (phi)
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7. PHNG TR RY NU NH- Theo di din bin mt s Ry nu nh
- Trng ging khng hoc ging chng chu
- B tr lch gieo s hp l
- Ct t chui thc n gim mt s
-Phun thuc phng tr. Ch phng tr trn nng m u v hn ch mt s gia
v
cui v
