Rice Flashcards
Gryllotalpa
orientalis
Mole cricket
They live in all rice environments but are most
prevalent in non-flooded upland rice fields with
damp soil.
Gryllotalpa
orientalis
Mole cricket damage is greater near the field borders
where they relocate after tillage operations
Mole cricket damage is greater near the field borders
where they relocate after tillage operations
Gryllotalpa orientalis
Cnaphalocrocis
medinalis)
Leaf folder
Leaffolders live in all environments but are
abundant during the rainy season. High humidity,
shady areas of the field, and excessive use of
nitrogenous
fertilizers
favor
their
rapid
multiplication.
Cnaphalocrocis
medinalis
Parapoynx stagnalis
Caseworm
Caseworm is found in irrigated and wetland areas
where standing water in the field is a prerequisite
for larval survival.
Paraponyx stagnalis
Caseworm is found in irrigated and wetland areas
where standing water in the field is a prerequisite
for larval survival.
Paraponyx stagnalis
Pelopidas mathias
Rice skipper
The adult is a stout brown butterfly with small
white spots on the wings. Adults are active during
the day, making darting, erratic movements from
which the name skipper was coined
Pelodipas mathias
Occurs in all rice environments, but prevalent in
rainfed rice. Upland environments with their
diverse microhabitats can provide more favorable
sites than lowland rice plains
Pelodipas mathias
Schistocerca gregaria
Shorthorned grass hopper
They are found in all rice environments but are
prevalent in rainfed areas. They tend to localize in
dry areas and rice fields adjacent to grasslands
where they breed.
Schistocerca gregaria
They are found in all rice environments but are
prevalent in rainfed areas. They tend to localize in
dry areas and rice fields adjacent to grasslands
where they breed.
Schistocerca gregaria
Spodoptera
frugiperda
Army worm
They live in all rice environments, but are serious
in upland rice as they need dry soil for pupation.
Lowland
fields
Spodoptera frugiperda
Larva is the damaging stage. Young rice plants are
often cut at ground level while older plants are
only defoliated
Spodoptera frugiperda
Hydrellia
philippina
Whorl maggot
t is a pest of rice seedlings only under irrigated and
rainfed conditions. Adults prefer ponds, streams,
lakes, and irrigated rice fields for their breeding.
Hydrellia philippina
The larva that causes damage is called the maggot.
It feeds on unopened leaves, nibbling the inner
margins.
Hydrellia philippina
Scirpophaga incertulas
Yellow stem borer
Yellow stem borer is a notorious pest of deepwater
rice. It is abundant in aquatic habitats where
flooding occurs and where multiple rice crops are
grown annually
Scirpophaga incertulas
White stem borer
Scirpophaga
innotata
The adult of this species looks similar to the YSB
except that it does not have any dark spot on the
forewings, in either sex.
Scirpophaga innonata
Predominant in rainfed areas where there is only one
wet season crop per year, Thus, this insect does not occur in areas with high
rainfall
Predominant in rainfed areas where there is only one
wet season crop per year, Thus, this insect does not occur in areas with high
rainfall
Scirpophaga innonata
WSB is presently found in the Visayas
and Mindanao.
Scirpophaga innonata
Sesamia
inferens
Pink stem borer
The adult moth is fawn-colored with brown streaks
on the forewings and white hindwings.
Sesamia inferens
They are abundant in upland rice grown near
sugarcane or related grasses. They are also seen in
upland rice fields of Claveria, Misamis Oriental
(Northern Mindanao).
Sesamia inferens
In young plants, the central
leaf whorl does not unfold, turns brownish, and dries
up, although lower leaves remain green and healthy.
Such symptom is referred to as
Deadheart
In older
plants, the panicles dry up with unfilled grains and
turn white. Such symptom is referred to as
Whitehead
Nilaparvata lugens
BPH
Rainfed and irrigated wetland fields are preferred. It
is rare in upland rice
Nilaparvata lugens
Heavy infestation creates brown
patches of dried plants known as
Hopperburn
They
also transmit virus diseases: ragged stunt, grassy
stunt, and wilted stunt.
Nilaparvata lugens
White-backed plant hopper
Sogatella furcifera
Nephotettix
virescence
Green leaf hopper
Grasses found near irrigation canals and levees, and
rice ratoons are favorable for feeding and egg-laying
Nephotettix virescence
transmitting viruses (tungro,
dwarf, transitory yellowing, and yellow-orange leaf)
and a mycoplasma disease (yellow dwarf)
Nephotettix virescence
Recilia
dorsalis)
Zigzag leafhopper
They are present in all rice ecosystems but only
transmits virus diseases to wetland rice, transmit orange leaf, tungro, and dwarf viruses
Recilia dorsalis
Leptocorisa oratorius
Paddy bug, seed bug
They are found in all environments but are prevalent
in rainfed wetland or upland rice. They are
destructive in areas where rainfall is evenly
distributed throughout the year
Leptocorisa oratorius
Scotinophara
coarctata
Rice black bug
They are
called shield bugs because of their shield-like
appearance. They produce an offensive odor when
disturbed.
scortinophara coarcata
Their saliva is toxic.
During severe infestations, young plants often die
and the whole field appears burnt. Such damage is
referred to as bug burn
Scotinophara coarcata
